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[Q] [HELP] Heat and signal problems on ZTE V970

Hi to all, I'm writing here because I had my first problems with my v970 (with etotalk rom). This evening I checked my mobile and I found that none of the sim was active (I was not in airplane mode) and I could not activate them, as if they were not in their slots. Meanwhile the upper part of the device began to heat up, so I tought it could be an antenna/receiver problem. I almost forgot to say that I installed Truecaller (deleting Contapps) and updated facebook and few others apps less than one hour before the event, but I already uninstalled them to exclude some of the possible causes. I'll gladly listen to any advice. Thank's in advance. GL

Restart, and see if it continues.

Already tried a lot of times, with or without sim cards. I also noticed an abnormal use of battery.

When did the problem start? What did you do before it started? Does your cellphone always have no signal, or does it come & go (sometimes SIM works, sometimes it doesn't)? Have you checked your APN settings?

post-mortem said:
When did the problem start? What did you do before it started? Does your cellphone always have no signal, or does it come & go (sometimes SIM works, sometimes it doesn't)? Have you checked your APN settings?
Click to expand...
Click to collapse
The problem started yesterday and I never experimented It till now. As I Said, before I encountered It, I updated some apps from the market and I changed the default caller manager (should I call It in this way?) with Truecaller. I also deleted my sim contacts
. I can't check apn because there are no apns to check (Android shows me the voice "mobile networks" but I can't select it
Update: I tried to restore the original rom, but the problem persists. I also made a check with the recovery, and it shows me that the device cannot detect sim cards. I begin to think that it's an hardware problem (ouch). Am I right?

What did you do in recovery that checks SIM cards? Are you talking about CWM recovery?

post-mortem said:
What did you do in recovery that checks SIM cards? Are you talking about CWM recovery?
Click to expand...
Click to collapse
Nope, it's the faulty recovery that etotalk sent me with the phone. I would like to install the cwm and flash another rom, but I'll leave that as the last option

If the recovery they sent you is faulty, then what good is it? If there's a custom recovery available for your phone, you might as well go with it, not that it'll solve anything by itself.
You might try inserting some kind of shim along with the SIM card to see if the extra pressure help make contact with the leads. Careful, of course, that whatever you stick in there doesn't stay behind.

post-mortem said:
If the recovery they sent you is faulty, then what good is it? If there's a custom recovery available for your phone, you might as well go with it, not that it'll solve anything by itself.
You might try inserting some kind of shim along with the SIM card to see if the extra pressure help make contact with the leads. Careful, of course, that whatever you stick in there doesn't stay behind.
Click to expand...
Click to collapse
I know about the recovery, but I was trying to don't invalidate the warranty (as if I'll ever use it...). Now I'm charging the phone, it's already the third time today...

Aw, heck. If you've got warranty, just send it in.

post-mortem said:
Aw, heck. If you've got warranty, just send it in.
Click to expand...
Click to collapse
Yep, I've got warranty, but sending it in China will cost me almost as much as buying a new one

Ok, I flashed a recovery and a custom rom, but nothing happened.The signal is still absent and the antenna heats up the same way as before. I tried to enter engineer mode and it shows me messages as "com.android.internal.telephony.CommandExcepti on: RADIO_NOT_AVAILABLE", "3G off. Cannot set", ecc... It also shows me "invalid IMEI" if I try to look at it and I cannot change it back with the AT +EGMR command (it says "Radio on" and "SIM State: ABSENT", altough the SIM card is in its slot).

I think you have to crack the case.

ArcheoGian said:
Ok, I flashed a recovery and a custom rom, but nothing happened.The signal is still absent and the antenna heats up the same way as before. I tried to enter engineer mode and it shows me messages as "com.android.internal.telephony.CommandExcepti on: RADIO_NOT_AVAILABLE", "3G off. Cannot set", ecc... It also shows me "invalid IMEI" if I try to look at it and I cannot change it back with the AT +EGMR command (it says "Radio on" and "SIM State: ABSENT", altough the SIM card is in its slot).
Click to expand...
Click to collapse
Hmmm... if your phone is reporting invalid IMEI numbers then I would try first to get that working as it should. Read this tutorial and re-write your IMEI numbers.
Then I would try the latest stock ROM, which is available on ZTE support website. Here is the direct link to the ROM.
If your phone still doesn't work after that, then I'm afraid you have a hardware problem.

I have had the telephone for more than one month with no problem. Trying every ROM made by Bruno with no problem at all with signal, but...
About 4 days ago, I started suffering exactly the same problems stated by ArcheoGian. I have tried everything (installing older Roms, rebooting, changing SIMs from 1 to 2, etc.) but unfortunately with no success. I just have to try to install the original ROM, but I supose it will be the same.
Afer a few reboots, I can make the telephone to search for a network, it founds it, it connects, it transfers data, I can make calls, but ramdomly (can be after 30 seconds, 30 minutes or maximum one hour) it disconnects and the red X of death (Xbox 360 times ) appears on top of the screen.
I can try to go and return from airplane mode, or search for networks that it won't re-connect.
I fear it can become a typical problem for this phone.
I am "delighted" to send it back to China and wait for two months to get it back (after explaining it to the seller and so on). Fingers crossed

@prinxo: did you buy it from eto...k? (I don't know if I can write the entire name of the seller)
Update: I tried everything it was told me (except to crack the case, at least not yet...), my last hope is to manually insert the IMEIs inside the data folder. There's just one problem: none of the methods suggested in the link posted by bcgngm works on my phone, so I need to generate the IMEIs whit my pc (I couldn't open the exe with windows 7, I'll try with win xp in a while, otherwise I have to ask someone to create it for me).

ArcheoGian said:
@prinxo: did you buy it from eto...k? (I don't know if I can write the entire name of the seller)
Click to expand...
Click to collapse
No, I bought it from another seller at Aliexpress.
As I thought: I tried to re-install an original ROM, and everything remains the same. I thought I was successfull but after one hour the phone disconnected itself from the network. After that moment, I need about 3 re-boots to get signal again and it lasts for just a few minutes.
At this point, I would disregard a software problem.
Happy happy to have to send it back to China.

ArcheoGian said:
Update: I tried everything it was told me (except to crack the case, at least not yet...), my last hope is to manually insert the IMEIs inside the data folder. There's just one problem: none of the methods suggested in the link posted by bcgngm works on my phone, so I need to generate the IMEIs whit my pc (I couldn't open the exe with windows 7, I'll try with win xp in a while, otherwise I have to ask someone to create it for me).
Click to expand...
Click to collapse
Why do you say it is not working? My preferred method is to use the adb commands (and for that you have to install Android SDK). Don't forget that when you type the commands there is no output message on the screen. The phone has to be restarted so that changes take effect.

bgcngm said:
Why do you say it is not working? My preferred method is to use the adb commands (and for that you have to install Android SDK). Don't forget that when you type the commands there is no output message on the screen. The phone has to be restarted so that changes take effect.
Click to expand...
Click to collapse
The third and the fourth ones are the only methods to restore IMEI I didn't try, just because I never used sdk and adb (and I'm not sure to be able to use them). I followed the others options (I also created the IMEI file with the russian program), but it continues to show me the "invalid IMEI" message. Can you help me, maybe showing me a good walkthrough?

This ADB Tutorial looks easy to follow. Check it out!

Question GPS stopped working as it used to after debloating. Which GPS Apks are pre-installed in the phone?

Hey, title is very much self descriptive. After debloating and removing a lot of what i would think were not essentials for the phone, GPS STILL does work, but only on OsmAnd, and not on other aps that use the map, and even then it takes several minutes for me to find location on the map. I ASSUME that this is because i removed something that lets app interact with mobile towers to get location and instead it relies only on sattelites to know where i am however this is mere speculation. I'd like to know if anyone with a lot more knowledge than i have could point me at which apps this phone would use stock with GPS or location services so that i could reinstall them and see what exactly did i break.

Consider this a bump, but in more specific terms. Could anyone help me identify or show me a list of potential GPS-related functionality APKs that would make other map apps not work properly?

Come on dude. Re-flashing is clearly your only option.
You would be better asking in other more popular Samsung Galaxy forums for general advice.

TimmyP said:
Come on dude. Re-flashing is clearly your only option.
You would be better asking in other more popular Samsung Galaxy forums for general advice.
Click to expand...
Click to collapse
This is usually where most of the advice regarding modifying the OS and debloating came from so i suspected it was the best place to ask.

Releases · 0x192/universal-android-debloater
Cross-platform GUI written in Rust using ADB to debloat non-rooted android devices. Improve your privacy, the security and battery life of your device. - 0x192/universal-android-debloater
github.com
use this and connect your phone via USB cable and enable ADB debugging in developer settings and give it perms when it pops up a prompt. Then set the 3 menus on the right to say All, Disabled/Uninstalled(Try Disabled and if it doesn't show anything try Uninstalled), and All Lists. It should show you a list of all the apps you have that you got rid of and you can press the button to get it back. It might work for you or it might not. If you mess up your phone even more its on you not me.
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CloudRealm said:
Releases · 0x192/universal-android-debloater
Cross-platform GUI written in Rust using ADB to debloat non-rooted android devices. Improve your privacy, the security and battery life of your device. - 0x192/universal-android-debloater
github.com
use this and connect your phone via USB cable and enable ADB debugging in developer settings and give it perms when it pops up a prompt. Then set the 3 menus on the right to say All, Disabled/Uninstalled(Try Disabled and if it doesn't show anything try Uninstalled), and All Lists. It should show you a list of all the apps you have that you got rid of and you can press the button to get it back. It might work for you or it might not. If you mess up your phone even more its on you not me.View attachment 5476313
Click to expand...
Click to collapse
Interesting, so that way i can keep track of which apk i removed?

Well, i just installed a maps app in the phone after having a reset from factory and.... Its working exactly like it used to? It still wont get GPS signal. Now im wondering what's going on.

hahaNSAgoBRRRR said:
Interesting, so that way i can keep track of which apk i removed?
Click to expand...
Click to collapse
Yep

hahaNSAgoBRRRR said:
Well, i just installed a maps app in the phone after having a reset from factory and.... Its working exactly like it used to? It still wont get GPS signal. Now im wondering what's going on.
Click to expand...
Click to collapse
Strange... maybe update the os?

You need to reflash everything with Odin *mod and start again. Sorry I cant help you as I needed it myself when I did the same with camera as I was debloating, and Im not sure how to do it.
I am, however, sure this is what you need to do. It is more than a factory reset.

Well... I did a factory reset again and this time the second that i connected the phone to the internet i downloaded a maps apk that i was using and... Yeah, it cant locate the phone, so either using only GPS no wifi the phone is hardly able to locate itself, or the phone is doing something weird about the GPS that my previous phone didn't, or the only time i accidentally dropped my phone from like 1 feet into the ground i broke something which is real unlikely, or the GPS receiver of this phone is THAT bad and my house is THAT good at blocking GPS signal.
What a weird conondrum.
I mean, crap, even google maps doesn't know where i am. Is this because i refused google's location services?

You need to reflash everything with Odin *mod and start again. Sorry I cant help you as I needed it myself when I did the same with camera as I was debloating, and Im not sure how to do it.
I am, however, sure this is what you need to do. It is more than a factory reset.

TimmyP said:
You need to reflash everything with Odin *mod and start again. Sorry I cant help you as I needed it myself when I did the same with camera as I was debloating, and Im not sure how to do it.
I am, however, sure this is what you need to do. It is more than a factory reset.
Click to expand...
Click to collapse
Dont worry dude, i already did a factory reset. My problem persists with the factory reset is the current topic of trouble to me.

FACTORY RESET WILL NOT FIX. REFLASHING ROM WILL NOT FIX.
I screwed my Camera up the same way, with just removing apks. You need to reflash the slots in odin and run multi-disabler and all that again.

TimmyP said:
FACTORY RESET WILL NOT FIX. REFLASHING ROM WILL NOT FIX.
I screwed my Camera up the same way, with just removing apks. You need to reflash the slots in odin and run multi-disabler and all that again.
Click to expand...
Click to collapse
Is it really "again" if i never did it to begin with?

Yes.

TimmyP said:
Yes.
Click to expand...
Click to collapse
Im a bit lost, how does this all work, what do you say i broke, and why do i need to use odin that factory reset wont fix?

idk why did I need odin when my camera stopped from doing the same thing? I flashed a new rom and went through initial setup, also did a factory reset, it still didnt work! Its a guess obviously since its not the exact same problem, but id say something similar is happening to your gps hardware.

TimmyP said:
idk why did I need odin when my camera stopped from doing the same thing? I flashed a new rom and went through initial setup, also did a factory reset, it still didnt work! Its a guess obviously since its not the exact same problem, but id say something similar is happening to your gps hardware.
Click to expand...
Click to collapse
Well, my issue so far seems to be quite similar to this one:
Is there a way to get GPS to work without Google Location Service constantly enabled?
The GPS on my Samsung Galaxy S2 cannot find my current location whenever Google Location Service is disabled. I have it disabled most of the time because my battery drains much faster when the ser...
android.stackexchange.com

If I were you (op) I would reflash stock, copy everything to PC (all apps/apks) and slowly remove a few at a time and test gps as I go along. I know that would take some time but eventually you would find which ones have to do with gps. You could also make a list of all the names of the apks and throw them in your "search" on a browser and see what all you can find out about them that way..
The most detailed explanation I have ever seen of descriptions of apps is definitely xXx No Limit magisk rom for OnePlus 6,7,8 devices. The dev has a user configuration file where you choose whether you want to keep, delete, replace each apk in the entire device and he has an explanation for every single app that tells what it's used for and if it's safe to delete or not. I would search all I could, and maybe do the copy/delete apk first and see what all you can find then maybe shoot No Limit rom dev a msg asking him. IDK him personally except from here using his rom when I had a OnePlus 6t but I bet he would respond. Most people will help you out "if" they can see whoever is asking for the help has already done some work in to whatever it is themselves.

note 20 android 13 0 B storage Bug

Hi all
I updated my note 20 ultra 5g from 12 to 13 by OTA PDA: N986BXXS5GVK9 and working fine but when I wake up morning while my device charged I found it 0 B storage so I restart my device and memory again normal. This practice am doing daily without any improvement.
If I go into the Settings > Storage section, all I see are 0 B everywhere. Calls, and receiving & sending messages in WhatsApp/SMs app works fine too. All apps that needs to store on internal user storage can't do it because its not there.
I did some actions like below:
I disabled the 4GB of extra RAM.
I cleared applications cache by ccleaner.
in the apps section in settings, 3 dots top right, special access and activate access to all media storage.
I am attaching some images if they can be of any help to anyone.
still issue not solved and I don’t want to reset format my device
regards
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That last image is showing -1B available storage.
Try clearing the system cache on the boot menu. Otherwise you're headed for a factory reset. Make sure all critical data is redundantly backed up... now.
Lol, Android the 13th

blackhawk said:
That last image is showing -1B available storage.
Try clearing the system cache on the boot menu. Otherwise you're headed for a factory reset. Make sure all critical data is redundantly backed up... now.
Lol, Android the 13th
Click to expand...
Click to collapse
thanks a lot
but these pictures not mine but same my issue 0 B.
i tried yesterday to off my device and push power & + volume tell Samsung display appear but i cant find recovery and device start normal

the dreamer said:
thanks a lot
but these pictures not mine but same my issue 0 B.
i tried yesterday to off my device and push power & + volume tell Samsung display appear but i cant find recovery and device start normal
Click to expand...
Click to collapse
You need to have a usb cable plugged in to get to recovery. Can't remember when they changed this .....

dvhttn said:
You need to have a usb cable plugged in to get to recovery. Can't remember when they changed this .....
Click to expand...
Click to collapse
Samsung's a mess. It's not like that on the N10+ Android 9/10. I think it's hardware mod rather than firmware?
Lol, I forgot abut that because I don't have to do it. Guess some fools were pocket factory resetting. Can't have that

yesterday i wiped cash & repair apps by connecting USB cable to my laptop by recover mode and working ok
but
today early morning 2:30AM i used my devise and found it -1 B like the picture so i did wipe cash again and waiting today if again memory storage lost or not

the dreamer said:
yesterday i wiped cash & repair apps by connecting USB cable to my laptop by recover mode and working ok
but
today early morning 2:30AM i used my devise and found it -1 B like the picture so i did wipe cash again and waiting today if again memory storage lost or not
Click to expand...
Click to collapse
Yeah, that's not acceptable behavior.
Dismount and remove SD card. See if that helps.
If you're stateside take it to a Samsung Experience center at a Best buy. They have advanced diagnostics, allegedly.
Factory reset. This could be malware. Reload with care, keep the trashware like WhatsApp off it. Bare bones load at first and then gradually add more apps. Social media apps are malware and should never be installed; login by browser only if you must visit them. This saves your battery and decreases your exposure.
If all that fails reflash firmware to last known good version ie older than is on it preferably. This is another reason I don't upgrade/update firmware; less variables and you can spot odd behavior faster . A known playing field makes troubleshooting much easier. Troubleshooting new firmware can be very time consuming*...
That last possibility is a hardware failure. However I still think the most likely suspect is a 3rd party app. If you do a reload lockdown all updates for all apps. Do a few or one at a time over the course of days. Keep a log*.
*this can get bloody. Consider using more advanced tools to find the app or process responsible for the behavior. I never had to do this with Android but you may need to. With Windows I did it more than once.

blackhawk said:
Yeah, that's not acceptable behavior.
Dismount and remove SD card. See if that helps.
If you're stateside take it to a Samsung Experience center at a Best buy. They have advanced diagnostics, allegedly.
Factory reset. This could be malware. Reload with care, keep the trashware like WhatsApp off it. Bare bones load at first and then gradually add more apps. Social media apps are malware and should never be installed; login by browser only if you must visit them. This saves your battery and decreases your exposure.
If all that fails reflash firmware to last known good version ie older than is on it preferably. This is another reason I don't upgrade/update firmware; less variables and you can spot odd behavior faster . A known playing field makes troubleshooting much easier. Troubleshooting new firmware can be very time consuming*...
That last possibility is a hardware failure. However I still think the most likely suspect is a 3rd party app. If you do a reload lockdown all updates for all apps. Do a few or one at a time over the course of days. Keep a log*.
*this can get bloody. Consider using more advanced tools to find the app or process responsible for the behavior. I never had to do this with Android but you may need to. With Windows I did it more than once.
Click to expand...
Click to collapse
thanks a lot for support
since my last wipe for cash my note working fine and no issue for memory tell now

the dreamer said:
thanks a lot for support
since my last wipe for cash my note working fine and no issue for memory tell now
Click to expand...
Click to collapse
Did you try to clear the davlik cach in recovery mode sometimes it help to refresh it

next_1989 said:
Did you try to clear the davlik cach in recovery mode sometimes it help to refresh it
Click to expand...
Click to collapse
i don't remember if i saw this option or no
but i did 2 steps only
wipe catch
&
repair apps
working fine tell now

Sometimes it happens like this because of flashing wrong pit files or after you remove frp or change the system files so the best way to make sure is do s backup with switch on your pc and flash the stock rom and restore your backup and check again

Try it and let me know

next_1989 said:
Sometimes it happens like this because of flashing wrong pit files or after you remove frp or change the system files so the best way to make sure is do s backup with switch on your pc and flash the stock rom and restore your backup and check again
Click to expand...
Click to collapse
why should i flash my device while its working fine

the dreamer said:
why should i flash my device while its working fine
Click to expand...
Click to collapse
If its working fine then dont flash sir

[GUIDE] Xiaomi Qin F21 Pro with US Bands

Xiaomi Qin F21 Pro with US Bands
LTE Bands 2, 4, 12, 13, 17, 66, 71 as provided by the US Qin F30 Kosher.
Things you need:
Windows PC (as far as I know this only works on Windows)
Qin F21 Pro with unlocked bootloader and TWRP installed.
See: https://forum.xda-developers.com/t/tools-mod-scripts-mlgmxyysds-qin-f21-pro-unlock-tool.4368277/
(This can be a headache, there are probably better ways to do this.)
See: https://forum.xda-developers.com/t/...om-firmware-root-playstore-certified.4405615/
You only have to follow this tutorial up to the point of installing the boot_2.img in TWRP you do not have to root if you don't want to. I do believe most of us with F21's probably have already done this entire tutorial though.
SP Flash Tool: See tutorial above, it comes with it.
ADB (and please know how to use it): https://www.xda-developers.com/install-adb-windows-macos-linux/
The files I provide with this link Which are: F30 files (from my purchased F30), my edited scatter file to show new partitions, SN Write tool with provided Database files.
https://www.mediafire.com/file/3fba0dugos3lkdv/F30_US_LTE_Bands_Package.zip/file
I WILL NOT BE HELD RESPONSIBLE IF YOUR PHONE DOESN'T BOOT, SOFT/HARD BRICKED! THIS TUTORIAL IS TO DO AT YOUR OWN RISK!
GUIDE:
1. Write down your F21's Original IMEI, Wifi Mac Address, and Bluetooth Address.
Go into your phone settings and scroll all the way down to "About Phone".
Here you will find your IMEI, Device Wi-Fi MAC address, and Bluetooth address.
WRITE THESE DOWN!!!!!!!! YOU NEED THESE LATER!!!!!!! I even included a txt file for you to do it in!
We want to write these down because we will need them for the SNwriter tool later.
2. Turn off your phone and boot into TWRP, you can do this by holding the heart/owl key (top left) and the * (star, bottom left) key, you will see the Douqin Logo. Keep holding until TWRP boots.
3. Plug the F21 into computer and TWRP will allow ADB connections. We are going to use ADB to pull/backup your modem and identifier files in case you mess up =)
DO NOT SKIP THIS STEP. WE WILL BE OVERWRITING THESE FILES - THEY CONTAIN THE IDENTIFIERS THAT YOU WROTE DOWN ABOVE.
Even though we will no longer be using these files, they are original to your phone, and I think its incredibly important to have a back up. I even included an empty folder for you to put them in!
Use the following ADB commands:
adb pull /dev/block/by-name/nvdata
adb pull /dev/block/by-name/nvram
adb pull /dev/block/by-name/nvcfg
Now find those files and put them some where safe!!!
(You can also use TWRP and copy the files, and put the on a USB stick or maybe some where else on the phone)
4. Turn off the phone again, you can do this from TWRP by going to Reboot and chosing Power Off.
5. Open SPFlash Tool and load the scatter file provided from my files "MT6761_Android_scatter - edited.txt". This will add the NVData, NVRam, NVcfg partitions to flashable partitions.
5a. Uncheck all the boxes we don't need and only check off nvcfg, nvdata, nvram, and md1img_a. These are the ONLY partitions we are flashing. (They should already be selected! BUT SO WILL THE PRELOADER, UNCHECK PRELOADER, I had to include it in the folder for the flashing to work, but we do NOT need to flash it!)
5b. Click the "location" portion of each row and find the corresponding file from the files I provided. (This should already be done!)
5c. When you got everything set up, click the Green Arrow Download button. With your phone turned off, hold the BACK button (top right) and plug it in. It will flash these files to your phone. KEEP YOUR PHONE OFF FOR NOW.
6. Open SNwrite tool on your computer, make sure ComPort says USBVCOM, and Target Type says Smart Phone.
6a. Open the System Config button and make sure ONLY IMEI, BT Address, and Wifi Address are checked off in the "Write Option" (top left) section.
6b. In the DataBase File section (at the bottom) and make sure "Load AP DB from DUT and Load Modem DB from DUT are checked.
6c. Click on the MD1_DB button and select the "MDDB_InfoCustomAppSrcP_MT6761_S00_MOLY_LR12A_R3_MP_V88_3_1_ulwctg_n.EDB" file located in the AP DB Base\\MT6761 folder (within SNwrite folder).
6d. Click on the AP_DB button and seelect the "APDB_MT6761_S01__W1947" file located in the AP DB Base\MT6761 folder (within SNwrite folder).
6e. Click Save and go back to the main window, click on "Start" and a new window will pop up. Remember how I told you to WRITE DOWN all of these from your F21? This is where we need it.
IMEI_1 = your original IMEI.
BT Addr = Your Bluetooth Address (no colons!)
Wifi Addr = Your Wifi MAC Address (no colons!)
6f. Before you click OK be sure to have your phone at the ready. You will need to, just like with SP Flash Tool, hold the back button as you plug it in! Click OK and plug in your phone with the back button held. Wait for the bar to progress and the green PASS signal to light up.
6g. When its done, your original identifiers will be flashed to your phone! Another window may pop up making you think you have to flash again, just close it as long as you saw that Green PASS signal you are good.
7. TURN ON YOUR PHONE AND ENJOY US LTE BANDS!!!!!! 2, 4, 12, 13, 17, 66, 71
These cover most of T-mobile and Verizon users!
Go back into your phone settings as in Step 1 and make sure your original IMEI, Wifi Mac Address and Bluetooth Address are there.
To confirm the bands, use the phone dialer and type:
*#*#3646633#*#*
This will take you into engineering mode (use at your own risk, don't mess with anything!) and click on Band Mode. Scroll thru the bands and you can confirm which ones are active. As far as which ones are currently being used, I am unsure of how to do that just yet. Will update when I know (was told there are apps that might be able to do this).
-----------------------------
Things to note:
AGAIN: BE SURE TO BACK UP YOUR FILES and write down your IMEI, Wifi MAC ADDRESS and BLUETOOTH ADDRESS! I cannot state this enough.
If you do not do the SNwrite tool (section 6 of the steps) you will have DUMMY made-up identifiers, and technically those will work for a while.. but you don't want to have the same ones as others, so please do section 6.
I cannot help you with unlocking your bootloader, that part can be easier and the tool I linked was not fun. There are apparently much easier ways, please look into them.
If you can unlock your bootloader, and install TWRP you can do the rest of these steps easy!
-----------------------------
If you would like to buy me a coffee: https://ko-fi.com/storymode
I'd like to thank:
Jbazt_katuforzs (XDA forums) for the Unofficial Qin F21 Pro firmware tutorial.
Sense_101 (XDA forums) who I couldn't have done this without, they helped me with learning ADB commands and knowing which files I would need to get this done.
mosheys (XDA) who told me about SNwrite tool.. which I knew about, but couldn't work before, and gave me the motivation to try again, really made this all come together.
jbriones95 (Reddit) who got me into Dumbphones and introduced me, through his videos, to the F21 Pro. The perfect phone for me!
eitokai (Reddit) who worked on tinkering with the F30 and made me believe I could do it too, and make progress - and everyone they thanked helped too!
Quick shout outs to Highpowers23 (Reddit), and 154FAviator (Reddit).
Lots of other random tutorials online where other people were trying to do similar things with their phones!!
-edits-
4/25/23: Fixed an issue where SPFlash tool was giving an Invalid Preloader error on Step 5a. I had to add the preloader file to the supplied download, but we do NOT need to flash the preloader. Edited step 5a to reflect change. Thanks to XDA user mosheys for pointing it out =)

amazing. looking forward to trying this out later tonight.

It worked! Amazing. Thank you for putting the time in to write this up.

Wow, and I always thought that network bands are hardware that can't be added...
How's that possible?

Hi
I have been using this flashed US Bands thing on my phone, and I notice there's few places that my phone just gets thrown off service, I can be in middle of a call and the call ends, etc
Also I miss a lot of calls due to it getting thrown off service in certain areas. (not talking here in basements etc, just random on street)
Anybody else experience such issues?

DEV845 said:
Hi
I have been using this flashed US Bands thing on my phone, and I notice there's few places that my phone just gets thrown off service, I can be in middle of a call and the call ends, etc
Also I miss a lot of calls due to it getting thrown off service in certain areas. (not talking here in basements etc, just random on street)
Anybody else experience such issues?
Click to expand...
Click to collapse
I'm sorry I haven't had any issues at all except for one time when I ran out of data unknowingly. What phone provider are you with? You might have to manually add their APNs to your settings.

shulemf said:
Wow, and I always thought that network bands are hardware that can't be added...
How's that possible?
Click to expand...
Click to collapse
That's what they'd like you to believe! It can be mostly true, but since the F21 has a US clone, the F30, I was able to make it work via their files. Next thing I really want to try is adding more bands if possible. But it involves hex editing perhaps which I'm no good at.

CatStoleTheCrown said:
That's what they'd like you to believe! It can be mostly true, but since the F21 has a US clone, the F30, I was able to make it work via their files. Next thing I really want to try is adding more bands if possible. But it involves hex editing perhaps which I'm no good at.
Click to expand...
Click to collapse
If you figure this out . Love my f21 so much since I used your guide

Can someone post a step by step video on how to do this

Will this work on f22 pro also?

Hi there! Thanks so much for the guide and the files
I followed all your instructions with my brand new F21 pro unlocked that I got from aliexpress, 64/4 version. when the phone arrived, it was already unlocked and had TWRP installed. So I went to follow your tutorial from that point. I specifically bought this phone to use on Verizon for a family member that does not use smart phones so this would be big upgrade for them, since most of the options for Verizon basic phones are bad choices.
Anyway, I consider myself fairly intelligent and computer savvy, I followed your instructions exactly and got no errors both times. first, I got the green checkmark after downloading the files then I did the imei writing I got the green PASS with 0 errors
so I go to turn the phone on, the system now appears "kosher." the Chinese play store is gone, etc. the system is telling me there is a software update which I ignore... when I plug the SIM card into the phone, I am not getting any cellular reception, however the phone does see that sim belongs with Verizon. my phone number shows up in the about section, as well as the original imei and Mac and bluetooth address. so it appears my writing to the phone was successful, but for some reason the bands are not active. I can do wifi calling with Verizon but not over cellular.
I really dont think I did anything wrong but I do have a question was the sp flash tool supposed to only say "download" in the drop down box from the first step?? was it supposed to be install and format??? I left it on download because I wasn't instructed to change anything and went about my business but I am just trying to figure out what went wrong.
again, I want to reiterate, the Verizon employee said they did not see the imei I provided to them with my current sim already in the phone, so why could they not see the f21 pro with original imei and lte bands after your guide? was he lying because they do not want me to use this phone? he asked me if the phone was Samsung and I just said yeah, he was foreign and I didn't feel like explaining.
really trying to figure out what went wrong here. it's frustrating that you can get it to work but I can't. I successfully copied the imei, Mac and Bluetooth address so I dont think that is it. when I go to look at the bands in the developer menu, I do not see the bands you mention with a check box next them. does that mean they are not active??
I really dont want to have to return this phone or sell it because it was a gift and it is actually quite nice for the money. so I put the SIM card back in the old basic phone (sonim xp5) and naturally, it is working as it should... this is a LTE sim and both phones use LTE, so I do not see what the problem is
is there something that must be changed manually in the cellular settings after sim insertion such as LTE/ CDMA only or something like that? again I am on Verizon and I have decent coverage where I am trying this.
thanks

it worked ! Thanks for sharing this guide !
TweakBox Tutuapp​

moogpunk said:
Hi there! Thanks so much for the guide and the files
I followed all your instructions with my brand new F21 pro unlocked that I got from aliexpress, 64/4 version. when the phone arrived, it was already unlocked and had TWRP installed. So I went to follow your tutorial from that point. I specifically bought this phone to use on Verizon for a family member that does not use smart phones so this would be big upgrade for them, since most of the options for Verizon basic phones are bad choices.
Anyway, I consider myself fairly intelligent and computer savvy, I followed your instructions exactly and got no errors both times. first, I got the green checkmark after downloading the files then I did the imei writing I got the green PASS with 0 errors
so I go to turn the phone on, the system now appears "kosher." the Chinese play store is gone, etc. the system is telling me there is a software update which I ignore... when I plug the SIM card into the phone, I am not getting any cellular reception, however the phone does see that sim belongs with Verizon. my phone number shows up in the about section, as well as the original imei and Mac and bluetooth address. so it appears my writing to the phone was successful, but for some reason the bands are not active. I can do wifi calling with Verizon but not over cellular.
I really dont think I did anything wrong but I do have a question was the sp flash tool supposed to only say "download" in the drop down box from the first step?? was it supposed to be install and format??? I left it on download because I wasn't instructed to change anything and went about my business but I am just trying to figure out what went wrong.
again, I want to reiterate, the Verizon employee said they did not see the imei I provided to them with my current sim already in the phone, so why could they not see the f21 pro with original imei and lte bands after your guide? was he lying because they do not want me to use this phone? he asked me if the phone was Samsung and I just said yeah, he was foreign and I didn't feel like explaining.
really trying to figure out what went wrong here. it's frustrating that you can get it to work but I can't. I successfully copied the imei, Mac and Bluetooth address so I dont think that is it. when I go to look at the bands in the developer menu, I do not see the bands you mention with a check box next them. does that mean they are not active??
I really dont want to have to return this phone or sell it because it was a gift and it is actually quite nice for the money. so I put the SIM card back in the old basic phone (sonim xp5) and naturally, it is working as it should... this is a LTE sim and both phones use LTE, so I do not see what the problem is
is there something that must be changed manually in the cellular settings after sim insertion such as LTE/ CDMA only or something like that? again I am on Verizon and I have decent coverage where I am trying this.
thanks
Click to expand...
Click to collapse
Hey there,
The fact that the bands aren't checked off in engineering mode indeed means that the bands aren't active (I did it and the bands showed up) you should of course redo the setup carefully in case you might have missed a step.
About Sp flash tool all you have to press is the green download arrow at the top of the window. And remember to make sure to deselect the preloader partition.
And not sure if I understood you correctly but you mentioned that after you finished the process you got the full kosher version on the phone, that shouldn't be the case because we are only copying the necessary partitions from the f30 for the service to work(I might have misunderstood you on that last one).

Potential_Threat said:
Hey there,
The fact that the bands aren't checked off in engineering mode indeed means that the bands aren't active (I did it and the bands showed up) you should of course redo the setup carefully in case you might have missed a step.
About Sp flash tool all you have to press is the green download arrow at the top of the window. And remember to make sure to deselect the preloader partition.
And not sure if I understood you correctly but you mentioned that after you finished the process you got the full kosher version on the phone, that shouldn't be the case because we are only copying the necessary partitions from the f30 for the service to work(I might have misunderstood you on that last one).
Click to expand...
Click to collapse
I had prepared the phone for the user I bought it for thinking I did al the steps right. when I realized the phone wasnt working, I re did the tutorial. it wiped all the apps and work I had previously done on the phone such as adding the play store, certification, etc and various apps. it was ready to go... so when I did the tutorial again, starting at the step where you load the F30 files, the phone appeared "kosher" when I flashed it and was once again app less... that is what I meant. it looked like I had started over.
was there anything about the bootloader or the unlocking process that may have not been done properly by the seller of the phone? Again, the phone arrived to me already unlocked and with TWRP installed so I skipped all those steps thinking I wouldn't need to do them.
what did I do wrong if I erased all the apps and the kosher version got installed and wiped the stuff I had already done when I tried to redo the process ?? I'm literally just following the instructions on a brand new phone.
the only thing I could think that I did wrong was skip the unlocking process but I only did that because I assumed the phone was already unlocked. I would assume it's unlocked if TWRP was already installed.... am I wrong ?

moogpunk said:
the only thing I could think that I did wrong was skip the unlocking process but I only did that because I assumed the phone was already unlocked. I would assume it's unlocked if TWRP was already installed.... am I wrong ?
Click to expand...
Click to collapse
Do you mean you bought the version with the Google play store ("unlocked") and that's why you bypassed the other stuff?

moogpunk said:
I had prepared the phone for the user I bought it for thinking I did al the steps right. when I realized the phone wasnt working, I re did the tutorial. it wiped all the apps and work I had previously done on the phone such as adding the play store, certification, etc and various apps. it was ready to go... so when I did the tutorial again, starting at the step where you load the F30 files, the phone appeared "kosher" when I flashed it and was once again app less... that is what I meant. it looked like I had started over.
was there anything about the bootloader or the unlocking process that may have not been done properly by the seller of the phone? Again, the phone arrived to me already unlocked and with TWRP installed so I skipped all those steps thinking I wouldn't need to do them.
what did I do wrong if I erased all the apps and the kosher version got installed and wiped the stuff I had already done when I tried to redo the process ?? I'm literally just following the instructions on a brand new phone.
Click to expand...
Click to collapse
And now with the kosher version, are you following the steps to fully unlock it first?

nemoslumbers said:
And now with the kosher version, are you following the steps to fully unlock it first?
Click to expand...
Click to collapse
I admit I skipped the unlocking part because I bought the "google unlocked world" version from aliexpress, and so I assumed it was done. and in the developer menu it said the phones boot loader was already unlocked... and the phone had TWRP already, so I assumed in order for TWRP to be there, it was unlocked already.
so I guess you are telling me that I shouldn't have skipped it because it wasn't truly unlocked then? okay, I will try it again.
I do not have the kosher version, I was referring to my f21pro phone after flashing with scatter f30 file.
also I just realized that when I was trying to unlock I was holding the wrong two "top buttons" I thought it was the owl button and the back button, not the camera button and the back button

moogpunk said:
yes. I skipped the unlocking part because I bought the "google unlocked world" version from aliexpress, and so I assumed it was done. and in the developer menu it said the phones boot loader was already unlocked... and the phone had TWRP already, so I assumed in order for TWRP to be there, it was unlocked already.
so I guess you are telling me that I shouldn't have skipped it because it wasn't truly unlocked then? okay, I will try it again.
I do not have the kosher version, I was referring to my f21pro phone after flashing with scatter f30 file.
also I just realized that when I was trying to unlock I was holding the wrong two "top buttons" I thought it was the owl button and the back button, not the camera button and the back button
Click to expand...
Click to collapse
Maybe give the two top buttons a try before trying the full unlock route? Only a suggestion! I also got the google unlocked world version and was going to try putting all of this on here this weekend. Hoping we don't actually have to go through the full unlock process and maybe it was just the wrong button combo!

nemoslumbers said:
Maybe give the two top buttons a try before trying the full unlock route? Only a suggestion! I also got the google unlocked world version and was going to try putting all of this on here this weekend. Hoping we don't actually have to go through the full unlock process and maybe it was just the wrong button combo!
Click to expand...
Click to collapse
I've read some conflicting reports about which buttons it's supposed to be. The actual readme says it's the top two buttons (Owl+back) and someone else, an administrator here actually, posted a photo circling the #+back button.... and someone liked that post assuming it was true
also, someone else said you can only get into TWRP by holding the Star and Owl button when the phone turns on then you have to immediately press the up and back button to boot into TWRP... which isn't entirely true... all you have to do is hold Star+Owl button to boot into TWRP...
I will admit I am new to the world of modding phones but not modding electronics which is why I felt confident enough to take on this project. I have modified many iPods with rockbox in my day and done physical modifications. I find this fun but it's teetering on extremely frustrating.
I am going to have to do the entire unlock process from the very beginning because I don't have any other choice, otherwise I am left with a phone I cannot use on Verizon. it will be waste of ~140usd. not the fault of the aliexpress seller, just poorly written instructions and dumb windows compatibility issues.

I cannot get the phone unlocked because I cannot get my computer to recognize the phone via usb. no amount of button combinations are letting my windows computer see the phone so I cannot unlock it.

Question IMEI / fingerprint problems... Any fix?

So today I'm doing the usual flashing of new roms to try them out and I run into a problem. During device setup, Google Fi fails to activate giving error code B042, and also errors out when it's time to register my fingerprint. Didn't think much of it at first, but now I've tried everything I can think of with no luck. Eventually I notice both IMEIs are listed as all zeros. I've wiped data multiple times, reflashed many factory and custom rom versions both with Android flash tool and manually, and always get the same issue with Fi activation and fingerprint scanner not working. I talked with Google techs and they just tell me to take it to Best Buy where it was purchased. I'm thinking a partition must have corrupted or something that doesn't restore during a typical reflash. Can anyone comment on what's going on, and if there's a way to go about fixing it myself. I do have both IMEIs listed on the box if there's a way to go about restoring them, but I doubt that would do anything with the fingerprint problem if even possible. Any insight would be greatly appreciated. Been on these forums for a decade and this may be my first time posting since I've always been able to work through problems myself, but I'm totally stuck on this one. Oh and the Pixel 7 pro I just bought to mess around with root and roms as a second phone, and my main S22u is still working fine, so not exactly an emergency or anything. Thanks in advance.

oncestruck said:
So today I'm doing the usual flashing of new roms to try them out and I run into a problem. During device setup, Google Fi fails to activate giving error code B042, and also errors out when it's time to register my fingerprint. Didn't think much of it at first, but now I've tried everything I can think of with no luck. Eventually I notice both IMEIs are listed as all zeros. I've wiped data multiple times, reflashed many factory and custom rom versions both with Android flash tool and manually, and always get the same issue with Fi activation and fingerprint scanner not working. I talked with Google techs and they just tell me to take it to Best Buy where it was purchased. I'm thinking a partition must have corrupted or something that doesn't restore during a typical reflash. Can anyone comment on what's going on, and if there's a way to go about fixing it myself. I do have both IMEIs listed on the box if there's a way to go about restoring them, but I doubt that would do anything with the fingerprint problem if even possible. Any insight would be greatly appreciated. Been on these forums for a decade and this may be my first time posting since I've always been able to work through problems myself, but I'm totally stuck on this one. Oh and the Pixel 7 pro I just bought to mess around with root and roms as a second phone, and my main S22u is still working fine, so not exactly an emergency or anything. Thanks in advance.
Click to expand...
Click to collapse
Sounds like your EFS partition got corrupted...
I haven't done anything with my P7P, it's stock, so can't offer any advice other than a google search to get you started... here

If the mod will erase it not state it. You mess with that you are on your own? Broke the op as well. Just delete it.