How To Convert My Samsung Galaxy S7 SM-G930S (SK Telecom) to SM-G930F (Global) ? - Samsung Galaxy S7 Questions and Answers

Hello everyone! This is my first post here.... Actually I've been using a Samsung Galaxy S7 (SM-G930S) for 2 months now, I recently discovered that my phone supports Dual SIM Cards as I saw 2 SIM Card slots in the SIM Card Tray... However there's only one IMEI in the device options (settings) and if a SIM card is inserted into the 2nd slot, nothing actually happens and the SIM card doesn't even get detected... So I wanted to change it's carrier from SK Telecom (SM-G930S) to Global (SM-G930F). Will this fix my issue? If yes, kindly let me know the whole process because this is the first time I'm doing this firmware installation thing And if I'm going in the wrong direction, kindly guide me. Thanks in advance to all the developers and experts out there

Changing the carrier won't assign an IMEI number to the second SIM slot.
It is actually possible to convert a single SIM exynos S7 to dual SIM, though it is dependent on what security revision your current firmware is. I did it successfully recently, but I had a logic board that had only been updated to S3 security, which is exactly the right kind for these instructions. With a later security update, you would need to find a matching combination file, and it may not necessarily work the same way.
The phone also won't boot properly with stock firmware after doing this, unless you root it. At least that's what I found. It will work with non-rooted custom firmware though.
instructions in this thread:
https://forum.xda-developers.com/galaxy-s7/how-to/converting-s7-single-sim-to-dual-sim-t3881189/amp/
---------- Post added at 05:12 PM ---------- Previous post was at 05:07 PM ----------
I should add, I wouldn't even attempt this if you've not had some experience of rooting, modifying, flashing custom ROMs etc.
Your first time figuring out how to install TWRP and flashing a custom ROM is easy in comparison to this.

Related

XT1575 Dual Sim experiment

Why not? I have a few motherboards on my bench.
Step 1 will be just try 2 Sims.
Then try root stock , and edit file to enable dual SIM
If not working, try aicp rom
.
Should be fun!
It was somewhere - only xt1572 RetAsia has connected both sim. @hometech99
dzidexx said:
It was somewhere - only xt1572 RetAsia has connected both sim. @hometech99
Click to expand...
Click to collapse
I know.
Well, now the xt1575 in the photo has both SIM connected.
I'll see what is the minimum to get it to work. Maybe it won't at all. But worth a try.
Look here:
https://forum.xda-developers.com/moto-x-style/help/eu-moto-x-style-dual-sim-hardware-t3215110
---------- Post added at 12:52 AM ---------- Previous post was at 12:51 AM ----------
@hometech99
see moto z play enable dual sim post, to see if there is any similar
i got my eu single sim xt1635 work on 2nd sim
Hmm...I'll try.
Editing the build.prop file puts the dual SIM menus into the OS. But it doesn't see the second SIM... says its not there.
I'm guessing that is due to the radio.
I tried installing truepure rom ( after full wipes) and selecting the Latin America DS version during the installation process. So I'm assuming it put in the LA ds radio files in ( or did it not?). But same situation where second SIM isn't seen.
I tried aicp and ril...just sits in boot animation, just like xt1572 ds owners have happened.
Question for the hardware gurus...Are the radio chips on the 1575 different than whats on dual SIM variants? Or is it literally just a firmware that makes the radio chip sets enable dual SIM and the frequencies that are covered?

Samsung SM-G930S... all the same as

I have a Samsung SM-G930S... which is Exynos 8890.
Can I then put on any ROM from any other Exynos 8890 based phone? And all will be well?
All will be well if you enjoy a brick
Only flash stock ROMs for your model S7 (G930S)
Bootloaders etc are different between models, it doesn't just depend on the chipset
JeffDC said:
I have a Samsung SM-G930S... which is Exynos 8890.
Can I then put on any ROM from any other Exynos 8890 based phone? And all will be well?
Click to expand...
Click to collapse
If custom roms, then yes. I have a G930L. Same korean variant as S & K.
012512 said:
If custom roms, then yes. I have a G930L. Same korean variant as S & K.
Click to expand...
Click to collapse
So then you stick to L, S and K supported custom ROMS? ...
I see quite a few custom ROMs for the G930F version but that would unsupported/dangerous?
JeffDC said:
I have a Samsung SM-G930S... which is Exynos 8890.
Can I then put on any ROM from any other Exynos 8890 based phone? And all will be well?
Click to expand...
Click to collapse
JeffDC said:
So then you stick to L, S and K supported custom ROMS? ...
I see quite a few custom ROMs for the G930F version but that would unsupported/dangerous?
Click to expand...
Click to collapse
That would be fine. Example custom rom for korean variants are superman rom, superstock rom. I'm currently using superman rom
012512 said:
That would be fine. Example custom rom for korean variants are superman rom, superstock rom. I'm currently using superman rom
Click to expand...
Click to collapse
012512, thank you for your answer. I will look up those two ROMS. This rooting of the Samsung phones seems a bit more complicated than the last time I was rooting, the LG-G3 and the OnePlus One, or is it my imagination.... or just getting more-forgetful?
When you look for ROM's compatible for your phone, are you looking specifically that they are for the SM-G930S, or exactly what are you looking for? Other non-Korean variants that will work?
Thanks again.
JeffDC said:
012512, thank you for your answer. I will look up those two ROMS. This rooting of the Samsung phones seems a bit more complicated than the last time I was rooting, the LG-G3 and the OnePlus One, or is it my imagination.... or just getting more-forgetful?
When you look for ROM's compatible for your phone, are you looking specifically that they are for the SM-G930S, or exactly what are you looking for? Other non-Korean variants that will work?
Thanks again.
Click to expand...
Click to collapse
Any custom tw roms will be fine. Take note that aosp roms are no longer supported for korean variants.
S7 korean variants are g93xK/L/S
So if you install a g930/5F custom tw rom, you can install it on your phone as long as you don't install the stock g93xF/FD roms.
Also, there is a separate twrp for korean variants in order to install a custom tw roms. Please refer "heroltekor" twrp.
---------- Post added at 08:27 PM ---------- Previous post was at 08:21 PM ----------
Example supported rom for korean variants:
[ROM][STABLE][N][7.0][DQIC][03.10.17][SM-G930F/FD/K/L/S/W8] SuperMan-Rom V2.7.0
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Excellent information, thank you. By trial and error, before picking up your post, I put on an Exynos Infinity 8+ from v8. It seemed to flash fine using the default Bixby CSC indicated in the setup. I did this last night so have not had time to chck out all things, however, cell phone, messaging, bluetooth all work just fine. I'm about to clean install the v17 of the Infinity in a few minutes. TWRP is a a** saver and my friend.
Thank you, again.
Jeff
JeffDC said:
Excellent information, thank you. By trial and error, before picking up your post, I put on an Exynos Infinity 8+ from v8. It seemed to flash fine using the default Bixby CSC indicated in the setup. I did this last night so have not had time to chck out all things, however, cell phone, messaging, bluetooth all work just fine. I'm about to clean install the v17 of the Infinity in a few minutes. TWRP is a a** saver and my friend.
Thank you, again.
Jeff
Click to expand...
Click to collapse
Hi,
I bought Samsung Galaxy S7 SM-G930S from the store which was converted into SM-G930FD as I was not having Korean sick apps installed in my mobile and there was no Korean logo of "BANDLTE" while switching off and switching on, when I saw my phone model name it was SM-G930FD and was supporting dual sim both had a same IMEI. But when I restarted my mobile after getting home phone got locked with this message "Custom Binary Blocked By FRP Lock" so decided to got into boot menu there I saw SMG930S written so i flashed mobile with SKT Korean firmware of smg930s but when I installed it I got tons of Korean apps and getting "BANDLTE" logo while switching off and on my phone I lost that Samsung Original logo which I had when my phone was converted into smg930fd. Now I want to switch back to Smg930fd settings/firmware so get rid of these Korean apps and Model to be appear as SMG930FD as the back of my Samsung Galaxy s7 glass has a phone model SMG930FD. I don't know Shopkeeper scammed me or what I told him I wanted to buy SMG930FD but he gave me this converted phone Kindly help me to get back to SMG930FD firmware/settings
shazmobile said:
Hi,
I bought Samsung Galaxy S7 SM-G930S from the store which was converted into SM-G930FD as I was not having Korean sick apps installed in my mobile and there was no Korean logo of "BANDLTE" while switching off and switching on, when I saw my phone model name it was SM-G930FD and was supporting dual sim both had a same IMEI. But when I restarted my mobile after getting home phone got locked with this message "Custom Binary Blocked By FRP Lock" so decided to got into boot menu there I saw SMG930S written so i flashed mobile with SKT Korean firmware of smg930s but when I installed it I got tons of Korean apps and getting "BANDLTE" logo while switching off and on my phone I lost that Samsung Original logo which I had when my phone was converted into smg930fd. Now I want to switch back to Smg930fd settings/firmware so get rid of these Korean apps and Model to be appear as SMG930FD as the back of my Samsung Galaxy s7 glass has a phone model SMG930FD. I don't know Shopkeeper scammed me or what I told him I wanted to buy SMG930FD but he gave me this converted phone Kindly help me to get back to SMG930FD firmware/settings
Click to expand...
Click to collapse
Same case for me, one thing different is that i bought the phone used from some random guy on the internet, i tried OTA to get Oreo as the phone had Nougat but it says no update available for me, 4G didn't work on my netword too, then when i saw samsung health not working i thought knox probably is voided when i checked odin i found its a 930S instead of the FD.
I do believe there is ways to convert to the 930F/FD by flashing select flash, using a box/dongle or some paid tool like R3 or Chimera or whatever you can get your hands on. I work on a repair workshop, have those i mentioned above and i saw this feature where you can actually select which part you wanna flash from a specified md5 file, i didn't test it on any phone yet, but i think they flash the bootloader of the real variant 930X but they put the AP of the international version 930F/FD, from the AP file you can also select what to flash and what to not, so you can actually only flash system.img of the XXXF version and the rest can be from the original variant. Never tested it but i think that's how it works.
My advice is to return the phone, that's what i'm going to do as i just bought it today (i was a happy dumbea** already bought few cases and whatnot...) the phone is still good and all functions perfectly, 4G might not work on some networks due to the different bands but everything else is the same! there is a big chance you can get the international firmware on it and be happy with it, but there is always a chance of breaking it too! or getting a network lock which i guarantee you, you're not going to like...
I don't know if this type of phones is refurbished, but i really hate that Samsung actually does that or allow this to be possible (happened before with an S6), same goes for LG too (Had a v10 korean model with Tmobile firmware).
Again, my advice, return it!!
Okay so here is an update on my case, might help anyone. if you did read my previous reply you'll know that i bought the phone from someone online, contacted him back he didn't block me nor ignore me, he even called me himself, but he bought a ps4 with my money and can't go back. Still waiting to see if he can get the money back, but what i was thinking is to ask for few dollars back just cause 4g network and dual sim functionality doesn't work on the phone, again its a 930S with 930FD firmware, after confirming and playing around its actually 930F not FD so i think i can get back the dual sim function. I'll be flashing the phone if i got no money back, try to get FD or 4G working on it and sell it for maximum price, then use the extra money i'll take from him to sorta re-gain my money and try to find a better one.
If i ended up flashing this 930S to a 930F or FD i'll post the method and the result and link it in another reply for anyone interested.
Wish me luck.
Salazar33 said:
Okay so here is an update on my case, might help anyone. if you did read my previous reply you'll know that i bought the phone from someone online, contacted him back he didn't block me nor ignore me, he even called me himself, but he bought a ps4 with my money and can't go back. Still waiting to see if he can get the money back, but what i was thinking is to ask for few dollars back just cause 4g network and dual sim functionality doesn't work on the phone, again its a 930S with 930FD firmware, after confirming and playing around its actually 930F not FD so i think i can get back the dual sim function. I'll be flashing the phone if i got no money back, try to get FD or 4G working on it and sell it for maximum price, then use the extra money i'll take from him to sorta re-gain my money and try to find a better one.
If i ended up flashing this 930S to a 930F or FD i'll post the method and the result and link it in another reply for anyone interested.
Wish me luck.
Click to expand...
Click to collapse
Bro I found a way you can download custom rom of smg930fd by installing TWRP or CF auto root method in this way your model will I guess automatically turn into dual sim supported and model will be shown as smg930fd.
I also have a 930S. How to >Bro I found a way you can download custom rom of smg930fd by installing TWRP or CF auto root method in this way your model will I guess automatically turn into dual sim supported and model will be shown as smg930fd.<
shazmobile said:
Bro I found a way you can download custom rom of smg930fd by installing TWRP or CF auto root method in this way your model will I guess automatically turn into dual sim supported and model will be shown as smg930fd.
Click to expand...
Click to collapse
Hi,
I'm facing the same situation. I bought G930FD dual sim but later I found that it's actually G930S.
Now I want to install its stock firmware which is Android 8.0 by SK Telecom, Korea
Can you please tell me:
1. Changing the ROM will covert the phone into Single SIM version?
2. The phone will lock to Korean network only?
3. This will change everything into Korean?
Cheers
[email protected] said:
Hi,
I'm facing the same situation. I bought G930FD dual sim but later I found that it's actually G930S.
Now I want to install its stock firmware which is Android 8.0 by SK Telecom, Korea
Can you please tell me:
1. Changing the ROM will covert the phone into Single SIM version?
2. The phone will lock to Korean network only?
3. This will change everything into Korean?
Cheers
Click to expand...
Click to collapse
1. Yes it will!
2. This one depends if your phone is unlocked or not, most of the time it is unlocked.
3. The firmware is all the same Korean, US, Canada or international the biggest difference will be in bloatwares, as I had that phone before I can tell you, you'll have many SK telecom apps.
4. (this one I added) If you flash your phone with the original Korean firmware which is by downloading the firmware for the S7 SM-G930s from Sammobile and flashing it using ODIN, going back is quite hard! So if you're network locked or you want the dual sim functionality back, you'll need a special tool/dungle called Z3x to make the thing work!
5. (I also added this) To unlock the phone and make it work on all networks there is a process called "Patching the certificate" and it requires an unlocked bootloader which probably you already have, and root! and most importantly! it only works on Android Nougat. Basically what Im saying you can only have dual sim function in Android Nougat with the 930FD firmware, also if you flash the original firmware and its network locked, if you wanna go back you'll need that tool I mentioned and again, only Android Nougat.
Had that phone before, still have the firmware backup for the 930StoFD also. I can help if needed.
Salazar33 said:
1. Yes it will!
2. This one depends if your phone is unlocked or not, most of the time it is unlocked.
3. The firmware is all the same Korean, US, Canada or international the biggest difference will be in bloatwares, as I had that phone before I can tell you, you'll have many SK telecom apps.
4. (this one I added) If you flash your phone with the original Korean firmware which is by downloading the firmware for the S7 SM-G930s from Sammobile and flashing it using ODIN, going back is quite hard! So if you're network locked or you want the dual sim functionality back, you'll need a special tool/dungle called Z3x to make the thing work!
5. (I also added this) To unlock the phone and make it work on all networks there is a process called "Patching the certificate" and it requires an unlocked bootloader which probably you already have, and root! and most importantly! it only works on Android Nougat. Basically what Im saying you can only have dual sim function in Android Nougat with the 930FD firmware, also if you flash the original firmware and its network locked, if you wanna go back you'll need that tool I mentioned and again, only Android Nougat.
Had that phone before, still have the firmware backup for the 930StoFD also. I can help if needed.
Click to expand...
Click to collapse
Thanks a lot mate for such a detailed reply
---------- Post added at 07:02 PM ---------- Previous post was at 06:29 PM ----------
Salazar33 said:
1. Yes it will!
2. This one depends if your phone is unlocked or not, most of the time it is unlocked.
3. The firmware is all the same Korean, US, Canada or international the biggest difference will be in bloatwares, as I had that phone before I can tell you, you'll have many SK telecom apps.
4. (this one I added) If you flash your phone with the original Korean firmware which is by downloading the firmware for the S7 SM-G930s from Sammobile and flashing it using ODIN, going back is quite hard! So if you're network locked or you want the dual sim functionality back, you'll need a special tool/dungle called Z3x to make the thing work!
5. (I also added this) To unlock the phone and make it work on all networks there is a process called "Patching the certificate" and it requires an unlocked bootloader which probably you already have, and root! and most importantly! it only works on Android Nougat. Basically what Im saying you can only have dual sim function in Android Nougat with the 930FD firmware, also if you flash the original firmware and its network locked, if you wanna go back you'll need that tool I mentioned and again, only Android Nougat.
Had that phone before, still have the firmware backup for the 930StoFD also. I can help if needed.
Click to expand...
Click to collapse
Thank you for such a detailed answer.
Now I'm confused to select a blue pill or red one
At one hand the current OS is outdated and have a very annoying and UN-stopable adware buit-in; but it's dual SIM
and on the other hand I may have an updated and ad-free OS by sacrificing dual SIM functionality
[email protected] said:
Thanks a lot mate for such a detailed reply
---------- Post added at 07:02 PM ---------- Previous post was at 06:29 PM ----------
Thank you for such a detailed answer.
Now I'm confused to select a blue pill or red one
At one hand the current OS is outdated and have a very annoying and UN-stopable adware buit-in; but it's dual SIM
and on the other hand I may have an updated and ad-free OS by sacrificing dual SIM functionality
Click to expand...
Click to collapse
What you can do is install TWRP recovery, you can download it from "twrp.me/Devices" and look for your specific device, backup everything and transfer it to a PC or a memory card, just in case you'd like to go back later, then you can flash the original firmware with Android Oreo and see if you like it more and if its worth dropping the dual sim for! if you don't like it, you just reFlash TWRP as it will be erased, format the partitions and restore the backup, You'll be back with Nougat and dual sim function but the network won't work till you patch the certificate (used to be called repair network), and for that you'll need root, debug enabled, and the z3x. Your issue will probably be that last one, z3x, cause as far as I know you'll need this tool or a similar one to get the network to work again! and just to mention, for some reason, if you erase the dalvik cache or reset the phone, you'll have to patch the certificate again.
Just think it through carefully, I work in a repair shop so I got access to lots of tools, but in your case if you don't, it might be quite hard to get things working again if they break.
Salazar33 said:
What you can do is install TWRP recovery, you can download it from "twrp.me/Devices" and look for your specific device, backup everything and transfer it to a PC or a memory card, just in case you'd like to go back later, then you can flash the original firmware with Android Oreo and see if you like it more and if its worth dropping the dual sim for! if you don't like it, you just reFlash TWRP as it will be erased, format the partitions and restore the backup, You'll be back with Nougat and dual sim function but the network won't work till you patch the certificate (used to be called repair network), and for that you'll need root, debug enabled, and the z3x. Your issue will probably be that last one, z3x, cause as far as I know you'll need this tool or a similar one to get the network to work again! and just to mention, for some reason, if you erase the dalvik cache or reset the phone, you'll have to patch the certificate again.
Just think it through carefully, I work in a repair shop so I got access to lots of tools, but in your case if you don't, it might be quite hard to get things working again if they break.
Click to expand...
Click to collapse
I simply flashed my device using Odin.
These is no more dual SIM functionality but I'm happy to have a latest firmware for S7 and I'm fee from the ads now.
[email protected] said:
I simply flashed my device using Odin.
These is no more dual SIM functionality but I'm happy to have a latest firmware for S7 and I'm fee from the ads now.
Click to expand...
Click to collapse
Happy to hear the issue is solved.
Couple of things you can try for a better experience if you like modding and tweaking.
If you have root and magisk, you can install a module that enhance your camera, it will increase the quality and add some extra features (I just installed it three days ago on my S8+, and the S7 is also supported, love it)
You can install a sound mod that gives you stereo like sound by using the earpeace and the bottom speak together.
Also with root you can patch your host file (Luckypatcher can do that) to block like 99% of the ads within the apps (I can't live without this one, life saver)
And can find tons more withing the forums, these are the ones I tried myself.

Canadian s7 not recognizing getting network with a european sim card.

So I've bought a second hand galaxy s7. It is a Canadian model SM-G930W8 . I live in Greece and have to use a greek sim card , the phone recognizes the sim card , but in the info it says unknown. Prior to an update I made it worked fine , but after the software update I am unable to get network reception . Anybody happens to know a way to fix the problem ? Will flashing a greek firmware solve the issue ?
You can try flashing just the home_csc, which contains carrier and frequency settings, from the Greek firmware onto your G930W8, but I'm not sure how different the 930W8 is to the 930F so you might risk a bootloop and have to flash stock. So make sure you've got what you want backed up.
What was the source of the update? Phone shows the correct IMEI?
I believe the 930w8 is exclusive to Canada.
audit13 said:
What was the source of the update? Phone shows the correct IMEI?
I believe the 930w8 is exclusive to Canada.
Click to expand...
Click to collapse
Yes it's a Canadian variant. .
---------- Post added at 07:19 AM ---------- Previous post was at 07:15 AM ----------
leodiavata said:
So I've bought a second hand galaxy s7. It is a Canadian model SM-G930W8 . I live in Greece and have to use a greek sim card , the phone recognizes the sim card , but in the info it says unknown. Prior to an update I made it worked fine , but after the software update I am unable to get network reception . Anybody happens to know a way to fix the problem ? Will flashing a greek firmware solve the issue ?
Click to expand...
Click to collapse
Somehow the update messed it up? Is it a stock update from Canada? I have a Canadian s7 from bell on 7.0
I updated the phone from samsung smart switch , the phone was probably modded beforehand to run greek sim cards, and the seller never mentioned this.And with the update the mod was most likely wiped or something.
leodiavata said:
I updated the phone from samsung smart switch , the phone was probably modded beforehand to run greek sim cards, and the seller never mentioned this.And with the update the mod was most likely wiped or something.
Click to expand...
Click to collapse
Try a different stock from sammobile or a Greek rom. But there shouldn't be that issue. Mine works in London with no problems.
I asked about the imei to ensure that the phone is showing the correct imei.
The model number has been confirmed in download mode?
Yeah I went in download mode and it is the one I have stated above , same model number on the back of the phone , I will check the imei when I get a hold of the phone , because a friend has it right now. Will try to flash greek firmware. And report back.
I booted into recovery and what is said there
-- applying multi-csc...
Applied the csc-code : TLS
successfuly applied multi-csc
That means that the phone is using the Canadian Telus Home.csc (I guess) .
So would flashing the home.csc from the Greek firmware work ? Does it have a chance to hard brick the phone ?

930FD Dual Sim Network Lock

Hi, my phone is currently locked to carrier smart. Before flashing my first rom, as long as I had 1 smart sim card on any sim slot, the other one can read any other carrier. After flashing rom, if I insert 1 smart sim and another one from a different carrier, I get the network lock notification. It works fine though if I just use 1 smart sim only, or smart sim for both sim slots.
Any ideas on how to revert this? Or are there any unlocking apps I can try for free? Thanks!
Got that same phone few days ago, and as far as my knowledge goes the F and FD version shouldn't be network locked as they ship world wide (international model with exynos chip). From what you saying, its after you flashed the ROM you got the second card locked, so my first question would be what ROM have you installed ? and can you link me to it. 2nd idea or question.. Did you flash the FD ROM or the F one? the F is a single sim version, it does have the second slot in there actually but its disabled or locked, so it might be that the 2nd slot is disabled or something. 3rd, have you tried other ROMs ? or even stock firmware, you can confirm if the ROM is the issue.
And my advice is to not try the apps, most of them are either outdated that only work with exploits in old android versions, or a complete scam. Waiting for your reply.
Hi Salazar, thanks for answering! I already forgot what rom it was - that was about 6 months ago. I remember then I had a backup of my EFS and baseband using TWRP. I remember restoring those when I first encountered the problem - that's how I got my 2nd sim slot working again. Problem is I've already lost that backup, and when i reformatted my phone yesterday, the 2nd sim slot wouldnt work anymore. Just tried flashing a number of custom and stock roms earlier today - problem still persists. If you happen to have the same device (G930FD) - mind sharing your TWRP backup for baseband and EFS?

SM-G892A Galaxy S8 Active Flash/Carrier Switch

Hello all,
I have an ATT S8 Active G892AUCU5CSF8 that i would like to work with a activated VZW sim card. I inserted the SIM in the unlocked ATT S8 Active, but had no success with getting texts or onto the Verizon network. Verizon BYOD shows my IMEI as not being supported. I have Odin and Patched Odin, but I was unable to flash to a Sprint Unlocked XAS Firmware. I assume this is because of the boot boot version being 1 as the file is: XAS-G892USQU1AQJ8, or the model being 892U
I also was unable to turn on the OEM Unlock and my FRP status shows as on in download mode
I am brand new to firmware updates and I have a few questions....
1. Are there any other S8 Model Numbers such as G950U or 892U that can work on a G892A? If anyone has any success with flashing other model number firmware for this device?
2. Would Sprint unlocked CSC allow me to utilize my activated VZW Sim card? I was simply going to attempt it and see what happened, but maybe asking the experts might be a better idea
3. Are there any version 5 or higher Sprint XAS firmware files anyway?
Thank you for your time
Check this out first. https://www.reddit.com/r/GalaxyS8/comments/7jdcno/psa_with_the_latest_us_carrier_updates_your_phone/ That being said, S8 and S9 models ending in the letter "U" probably will work. Usually, this works when a phone is carrier unlocked and you switch sim cards. With these models you do not normally get a sim unlock screen. (if it is already unlocked) unlock through your carrier. S8 and S9 models have trouble with non verizon mvno sim cards. Trick - boot with a Verizon sim card (good or bad) ((The phone will switch settings to accommodate the verizon sim card. YOU SHOULD SEE A VERIZON SPLASH SCREEN AT START UP. Once up, verify the verizon access point is set. hold the power button down - choose emergency mode ---remove the verizon sim card, put in the non verizon CDMA card - hold the power button, turn off emergency mode and you verizon settings will be there. DO NOT RESTART THE PHONE. or you will have to go through it all again. Works on my S8+ G855U, maybe your ATT G892U. Note, the "U1" models are supposed to switch without the gymnastics with the sim card.
Just checked Sammobile. You may be out of luck. https://www.sammobile.com/firmwares/. Your model Sm-G892A has valid firmware for ATT and Sprint. Your firmware looks correct for an unknown XAS model. That being said, you could try the same tricks before with a Sprint sim card and a Sprint mvno card. Red Pocket carries all four carriers Get a non active sprint card on ebay. pennies. I started by going back to the original firmware. Then learned the upgrade process and took mine from 2017 stock 7 nougat up to 2020 9 Pie. Again, make sure you are unlocked from ATT first. If it doesn't switch on booting with a different sim card, I doubt you will have much luck.
---------- Post added at 09:42 PM ---------- Previous post was at 09:41 PM ----------
correction Sprint and T-Mobile.
---------- Post added at 09:48 PM ---------- Previous post was at 09:42 PM ----------
Last thing. I did notice if I used an ATT sim card in my S8+, it would boot to ATT Splash. If I used T-mobile, it would go to T Mobile Splash. However, if I did the trick while using an ATT card (i.e. emergency mode and switch the card To Red Pocket mvno for ATT gsm) it still worked. However, if I ever shut it down and restarted it would go to the T-Mobile splash even though I had the Red Pocket (ATT specific card) Therefore to get the ATT settings back, I would have to do the sim/emergency mode procedure again.
I have the SM-G892A, unlocked, and I'm using it on T-Mobile. APN all correct. Booted from stock with the TMO card but can't get the phone to display Wifi Calling option. This is the only reason I would try rooting and flashing TMO firmware. Which sounds sketchy from what I read above. My question: Any other thoughts on activating Wifi Calling? Thanks for responding.
Axilarry, you have a g892a on T-mobile? How did you do it? I can't get mine out of att 'mode', preconfig only gives me the att option. Custom rom, root? Please share.

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