Database Info

Duos Nougat Update

I am just wondering if anyone with a Samsung S7 Duos has received the update. Someone told me to look at the CSC code, but never explained what that would tell me.
My CSC code is: G930FOJV1BPK2
Now sure what that means or if will tell me when I can expect the OTA to nougat. Any help?

It means that you would get the OTA if your CSC firmware area has received them. I have DUOS or G930FD with XSG CSC, and this particular CSC received the updated, but I already had side loaded it so I can't say for sure when or if I was going to receive it eventually.

JCBRR1 said:
It means that you would get the OTA if your CSC firmware area has received them. I have DUOS or G930FD with XSG CSC, and this particular CSC received the updated, but I already had side loaded it so I can't say for sure when or if I was going to receive it eventually.
Click to expand...
Click to collapse
Thanks for the info, but what is my CSC area? And how do I check if that area got the firmware?

The CSC is the code that sets what region your phone is intended for. You can use Phone Info to look up what it is set to:
https://play.google.com/store/apps/details?id=org.vndnguyen.phoneinfo

Sea-Wolf said:
The CSC is the code that sets what region your phone is intended for. You can use Phone Info to look up what it is set to:
https://play.google.com/store/apps/details?id=org.vndnguyen.phoneinfo
Click to expand...
Click to collapse
Thanks, I installed it an apparently my phone was made in Vietnam. I am assuming the update is not out for vietnam yet, is that why I havent gotten it?

vonedaddy said:
Thanks, I installed it an apparently my phone was made in Vietnam. I am assuming the update is not out for vietnam yet, is that why I havent gotten it?
Click to expand...
Click to collapse
They're almost all made in Vietnam. You need to swipe across to the next tab called CSC Code and there will be a line there called Active CSC Code which will be a three letter code like THL or XSA.
It's possible to flash a different CSC and firmware fairly easily using a tool called Odin. There's lots of guides on here about how to do it. Personally I'm just being patient and waiting for it to start rolling out to more countries. But a lot of people are flashing the British CSC and firmware (BTU) to get the update now.

So the code I have is AFR (Kenya / AE) How does this help me know when / if the upgrade is available?

vonedaddy said:
So the code I have is AFR (Kenya / AE) How does this help me know when / if the upgrade is available?
Click to expand...
Click to collapse
First off, the OS update will be available at some point. When is pretty much impossible to say. As far as I know, only a handful of CSC have recieved N OS, your best bet if you want to install it on your S7 now is by sideload it using ODIN which is a very easy process that won't affect your warranty. Look for a source of the flashable firmware (sammobile for example) and follow the instructions. There are tons of videos on YT showing the upgrade process ass well.

Any way to get VoLTE working with international phone?

Hello
I bought an s8+ from HK which is the dual SIM Snapdragon version (G9550). Using it here in Australia, everything works as expected as it supports all of our bands, however VoLTE does not work. I've read this is because the CSC does not match a local CSC.
Unfortunately there are no Snapdragon versions sold here, hence no firmware with the Aus CSC (XSA) that will support VoLTE (as I read you can't flash the Exynos ROM onto the Snapdragon).
Is there any way I can enable VoLTE? Can I somehow change the CSC without an official ROM? Like go into the G9550 ROM and replace the CSC with the Aus CSC?
The only other region with the Snapdragon is the US from what I can tell, which probably wouldn't enable VoLTE either.
Any advice is appreciated
Thanks.

ult_nrg said:
Hello
I bought an s8+ from HK which is the dual SIM Snapdragon version (G9550). Using it here in Australia
Is there any way I can enable VoLTE? Can I somehow change the CSC without an official ROM? Like go into the G9550 ROM and replace the CSC with the Aus CSC?
The only other region with the Snapdragon is the US from what I can tell, which probably wouldn't enable VoLTE either.
Any advice is appreciated
Thanks.
Click to expand...
Click to collapse
You may root and then flash your csc zip (or simply replace the CSC files in the custom rom with your CSC files). You should get VoLTE. Download Multi CSC file from here and extract your csc.
I do the same but with India CSC on USA snapdragon models.

nimms said:
You may root and then flash your csc zip (or simply replace the CSC files in the custom rom with your CSC files). You should get VoLTE. Download Multi CSC file from here and extract your csc.
I do the same but with India CSC on USA snapdragon models.
Click to expand...
Click to collapse
Thanks nimms. This is pretty much exactly what I was after, except I cannot root the phone (work required Knox so I can't trip it ). I was hoping I could do somthing like the above, only via Odin, but it sounds like you can't change the CSC without rooting the phone due to making system changes.

Try this code in dialer *#272*imei# and change your csc from there

thatsupnow said:
Try this code in dialer *#272*imei# and change your csc from there
Click to expand...
Click to collapse
Thanks for the reply!
I've tried that but unfortunately get a dialog saying "UNKNOWN APPLICATION".

ult_nrg said:
Hello
I bought an s8+ from HK which is the dual SIM Snapdragon version (G9550). Using it here in Australia, everything works as expected as it supports all of our bands, however VoLTE does not work. I've read this is because the CSC does not match a local CSC.
Unfortunately there are no Snapdragon versions sold here, hence no firmware with the Aus CSC (XSA) that will support VoLTE (as I read you can't flash the Exynos ROM onto the Snapdragon).
Is there any way I can enable VoLTE? Can I somehow change the CSC without an official ROM? Like go into the G9550 ROM and replace the CSC with the Aus CSC?
The only other region with the Snapdragon is the US from what I can tell, which probably wouldn't enable VoLTE either.
Any advice is appreciated
Thanks.
Click to expand...
Click to collapse
Hi
As far as I'm concerned, this is not possible without tripping the Knox counter. And if you try flashing the XSA CSC (via Odin), you will definitely soft brick your phone

ims setting. maybe can fix your issue ,just download a hidden app display. then you can open ins setting

t-shock said:
Hi
As far as I'm concerned, this is not possible without tripping the Knox counter. And if you try flashing the XSA CSC (via Odin), you will definitely soft brick your phone
Click to expand...
Click to collapse
Odin won't even flash it, It's pretty hard to soft brick this phone with official tools and firmware.

Interceptor777 said:
Odin won't even flash it, It's pretty hard to soft brick this phone with official tools and firmware.
Click to expand...
Click to collapse
Yes
Odin won't flash it but if you try to flash it and after that you reboot, you will stuck at download mode. Only by flashing the correct files, will make it boot

t-shock said:
Yes
Odin won't flash it but if you try to flash it and after that you reboot, you will stuck at download mode. Only by flashing the correct files, will make it boot
Click to expand...
Click to collapse
Interesting.
Another question...the only difference I've noticed between the 9550 (HK) and 955U (US) is that the US version does not have Band 28 but the HK version does, which we do use here in Aus.
If I flashed a US firmware (which has the same S835 SoC), would I lose Band28, or would the modem still be able to use it?
EDIT: what if I only flashed the CP file (modem), is this interchangeable between the different SoCs? Could I flash the XSA CP (modem) onto another ROM, or will this soft-brick?
wangksn said:
ims setting. maybe can fix your issue ,just download a hidden app display. then you can open ins setting
Click to expand...
Click to collapse
My IMS is saying "Not registered" in the about phone. I can't seem to do anything about it, and the hidden menu doesn't give me the option to change it.

IMS setting is located explicitly on "Settings -> Mobile Networks -> Access Point Names"
The best bet you may try is to find a Samsung phone thats currently in VoLTE then copy IMS apn settings onto you phone (you manually input the settings).

ult_nrg said:
Interesting.
Another question...the only difference I've noticed between the 9550 (HK) and 955U (US) is that the US version does not have Band 28 but the HK version does, which we do use here in Aus.
If I flashed a US firmware (which has the same S835 SoC), would I lose Band28, or would the modem still be able to use it?
EDIT: what if I only flashed the CP file (modem), is this interchangeable between the different SoCs? Could I flash the XSA CP (modem) onto another ROM, or will this soft-brick?
My IMS is saying "Not registered" in the about phone. I can't seem to do anything about it, and the hidden menu doesn't give me the option to change it.
Click to expand...
Click to collapse
it is can change if you know the parameter. I see have a lots of valume, I don't know why I can't upload the snapshot to hare

Hey , its too easy to get CSC to another Provider. Just ADB Sideload it. I can give you the mod for Germany VD2 or Verizon USA. No Tripping and knox 0x0

012345678 said:
Hey , its too easy to get CSC to another Provider. Just ADB Sideload it. I can give you the mod for Germany VD2 or Verizon USA. No Tripping and knox 0x0
Click to expand...
Click to collapse
Please, write detailed instructions for G9550 and example .zip

012345678 said:
Hey , its too easy to get CSC to another Provider. Just ADB Sideload it. I can give you the mod for Germany VD2 or Verizon USA. No Tripping and knox 0x0
Click to expand...
Click to collapse
+1

Dr. said:
[No_WaY;76004070]+1
Click to expand...
Click to collapse
I need the mod please for changing csc

012345678 said:
Hey , its too easy to get CSC to another Provider. Just ADB Sideload it. I can give you the mod for Germany VD2 or Verizon USA. No Tripping and knox 0x0
Click to expand...
Click to collapse
Do not enter people astray, ADB Sideload It's not working - error "signature verification failed"
need ROOT
VD2-CSC-S8S8p
MY Galaxy S8+ SM-G9550, SW - G9550ZHU2AQL2

Just download an official ROM (A variant from a country that supports VoLTE) for ur model from sammobile or u might even find it on the xda forum and flash it via odin with Home CSC.
It works well... No need to root n KNOX counter wont be tripped...
PS: Backup data.. They will be lost in the process.

Now we're talking about ADB, not ODIN or TWRP.
Flash via ADB Sideload - not possible. You understand me. Smartphones snapdragon not flash Exynos SW. You can only edit an existing profile CSC or add new CSC.
Example:
my smartphone TGY (snapdragon model SW)
but I live in the region of SER (EXYNOS MODEL SW)

GRIBL said:
Now we're talking about ADB, not ODIN or TWRP.
Flash via ADB Sideload - not possible. You understand me. Smartphones snapdragon not flash Exynos SW. You can only edit an existing profile CSC or add new CSC.
Example:
my smartphone TGY (snapdragon model SW)
but I live in the region of SER (EXYNOS MODEL SW)
Click to expand...
Click to collapse
Right, My bad... I missed the international part itself...
But as far as i know, Exynos CSCs also dont go with the Snapdragon CSCs... I could be wrong.

General G996U and G996U1 Firmware Links and Flashing Discussion Here

For those who aren't already aware, G996U is the model number of all of the US carrier versions of the S21+. The G996U1 is the model number of the same device, but sold by Samsung SIM unlocked and with no carrier bloatware. Firmware is 100% interchangeable among these models: any U or U1 firmware version can be flashed to any U or U1 device at any time, assuming that you're not trying to downgrade the bootloader. A "U to U" or "U1 to U1" flash does not require a factory reset, but changing from one firmware to the other will require one. Also, U firmware is identical for the 4 base files (AP, BL, CP, CSC) for each individual build, no matter which carrier it comes from. So if you download 2 different carrier versions of the exact same build, the 4 base files will be identical. Where the firmware differs is in the USERDATA file - that's where the carrier bloatware and customizations reside.
Manual Odin flashing is designed for those who:
- want to manually update to a newer version of U firmware on their U device, either because they don't want to wait for their carrier's OTA or because OTAs aren't working on their device, or a different carrier got a new feature/patch before they did
- want to flash U1 firmware to their U device
- want to convert from U1 firmware to carrier U firmware
- want to convert from one carrier's U firmware (with all apps and bloatware) to a different carrier's U firmware (with all apps and bloatware)
For those who aren't already aware, anyone can now download firmware for almost any Samsung device any time that they want, via the various firmware download tools posted here on XDA like SamFirm or Frija. There are threads and info about them here on XDA so I won't waste time explaining - do a search if you're not already familiar with these tools. But they only provide whatever the latest/newest/current version is - nothing older. I pay for a subscription to a site that gets the official releases (usually) before they hit the firmware download tools, so that's where my files come from.
This is not a "beginner's guide to Odin flashing" -type post/thread, so I won't list basic, step-by-step flashing instructions. My threads are geared towards those who already know what they're doing. If you're new to manually flashing Samsung firmware (or haven't done it in a long time), I recommend you consult one of those "beginner's" guides- there are tons of them here on XDA.
Happy flashing!
U firmware: https://www.androidfilehost.com/?w=files&flid=322091
U1 firmware: https://www.androidfilehost.com/?w=files&flid=322092
Notes:
- DON'T QUOTE THE OP WHEN YOU REPLY, kthx
- I have lots of threads just like this one for other Samsung flagships, if it interests you. For those who have already made use of my previous threads for a different device and are upgrading to an S21, welcome back
- My zips are compressed extra small for space and bandwidth savings. The default Windows extractor can't handle it, so you'll need a 3rd party tool like 7zip, WinRAR, etc
- it's quite time consuming to download the files, zip them up, and upload them to AFH. And, I do threads like this for every single Sx and Note x model, so I won't be uploading every single version. The only full builds that I upload are ones where I get access to a new bootloader and/or Android version early, before they hit the firmware download tools.
- My naming method for folders on AFH is: build - bootloader - Android version
So "SAT - 1 - 9.0" means the full build number ends in SAT, it's bootloader version 1, and it's Android 9.0. When bootloader and Android versions increment, the first build to have those changes will have its folder notated appropriately.
- HOME CSC file keeps data intact; using the other CSC will wipe data. Flashing USERDATA will also wipe data.
- Since AT&T doesn't allow their firmware to be publicly available (for any of their devices), I'll try to always upload at least one USERDATA per bootloader increment for AT&T (and Cricket, if they get this model). I'll also upload any full builds if AT&T is the only carrier to get that specific build, because you won't be able to find the files anywhere else.
- For identifying USERDATAS, and to know what region/CSC to use in the firmware download tools if you're downloading yourself:
AIO = Cricket (not available via firmware download tools)
ATT = AT&T (not available via firmware download tools)
BST = Boost Mobile
CCT = Xfinity Mobile (Comcast)
CHA = Spectrum Mobile (Charter)
DSH = Dish Network
SPR = Sprint
TMB = T-Mobile
TMK = Metro PCS
USC = US Cellular
VZW = Verizon (available via firmware download tools, but Manual Entry is required - Auto will not work)
XAA = U1 firmware
- the correct procedure for switching from one carrier's firmware to another is:
1. Flash full U1 firmware package including non HOME CSC
2. Upon boot, insert a SIM of the carrier whose firmware you want
3. Watch for the popup that says "reboot to apply new carrier settings" etc, and do it
4. After that restart completes, reboot back to Download mode and flash the full U firmware package, with the USERDATA file of the carrier whose firmware you want

Initial U firmware and AT&T USERDATA are posted, along with U1 firmware. U firmware is not yet accessible in the firmware download tools like SamFirm and Frija, but if anyone wants a different carrier's USERDATA (for flashing bloatware to a U1 device or for converting a U device from one carrier's bloatware to a different one), let me know and I'll get it for you

Are the firmware in OP compatible for the S21 (Non-plus)?

craznazn said:
Are the firmware in OP compatible for the S21 (Non-plus)?
Click to expand...
Click to collapse
This thread is in the S21+ forum, not the S21 forum.
This thread is for model numbers G996U and G996U1, not G991U or G991U1.
If you're looking for S21 firmware, that will be found in the S21 forum

I agree with you

Does the firmware control the SIM lock? So, can you flash the U1-XAA firmware and use say a phone purchased from AT&T on another carrier? Or do you need to do the SIM unlock before flashing?

3BeersKen said:
Does the firmware control the SIM lock? So, can you flash the U1-XAA firmware and use say a phone purchased from AT&T on another carrier? Or do you need to do the SIM unlock before flashing?
Click to expand...
Click to collapse
SIM unlock always goes much deeper than firmware. Flashing U1 will never automatically unlock any model - the unlock has to be done separately. If desired, I can provide a recommendation for a professional 3rd party business to do the unlocking, for any interested users who may not meet the carrier's unlock requirement(s).

Thanks. That's what I figured, but wanted to make sure. I like to get off of the AT&T firmware as quickly as possible as you can't get their updates unless you have an active SIM in the phone.

3BeersKen said:
You can't get their updates unless you have an active SIM in the phone.
Click to expand...
Click to collapse
Correct. They're A-holes like that haha

iBowToAndroid said:
Correct. They're A-holes like that haha
Click to expand...
Click to collapse
I got TMobile s21+ and want flash to u1,do you know which odin should I use, thanks

yijinsa said:
I got TMobile s21+ and want flash to u1,do you know which odin should I use, thanks
Click to expand...
Click to collapse
3.14.1 patched

I don't have my S21+ yet but it will be here soon. I ordered from Samsung and selected the Verizon version as unlocked was considerably more expensive.
Does anyone know what Verizon specific bloatware the S21+ has?
Are there certain apps which can be uninstalled with the U1 version but not the Verizon U version?
Are there any potential speed benefits on the 5G network that would be lost using the U1 version, or features like tethering that won't work?
For updates in the future, would they arrive faster on the U1 version, slower, or the same?
My main purpose in flashing from U to U1 is to free up the maximum amount of space of the 128 GB while still retaining 100% of the speed and features I would have with the Verizon version.
Thank you for educating me! It's been a couple years since I flashed my Note 8.

I order a unlocked S21+ U1 version straight from Samsung and didn't have to put in any VZW info.
There is a buttload of Samsung bloatware but no VZW except fot MyVZX

Have anyone here with T-mobile version stuck on TMB/TMB/TMB after going to U1 firmware?
Someone over S21 Ultra have this problem, but I'm not sure if Android 11 tinker or T-mobile side. Used to be XAA/XAA/TMB

x1tymez said:
Have anyone here with T-mobile version stuck on TMB/TMB/TMB after going to U1 firmware?
Someone over S21 Ultra have this problem, but I'm not sure if Android 11 tinker or T-mobile side. Used to be XAA/XAA/TMB
Click to expand...
Click to collapse
Yes, that seems to be a common issue with T-Mobile S21s - all 3 models

iBowToAndroid said:
Yes, that seems to be a common issue with T-Mobile S21s - all 3 models
Click to expand...
Click to collapse
You think there will be a fix for this? It's weird that dialer codes also don't work.

x1tymez said:
Have anyone here with T-mobile version stuck on TMB/TMB/TMB after going to U1 firmware?
Someone over S21 Ultra have this problem, but I'm not sure if Android 11 tinker or T-mobile side. Used to be XAA/XAA/TMB
Click to expand...
Click to collapse
I've got a T-Mobile locked that I was able to get flashed over to U1 without much trouble. Shows mode number SM-G996U1 now, build number shows same.
edit: Nevermind, I see the TMB/TMB/TMB

krisology said:
You think there will be a fix for this? It's weird that dialer codes also don't work.
Click to expand...
Click to collapse
Dialer codes don't work? On which firmware?

iBowToAndroid said:
Dialer codes don't work? On which firmware?
Click to expand...
Click to collapse
XAA U1, VZW U1, stock TMB U, and I've tried the TLI U1 above and couldn't get it to work. Using google dialer, I input the codes like *#*#27262826#*#* and as soon as I type the last star it just disappears and nothing pops up. I tried with T-Mobile and Verizon sim.

krisology said:
XAA U1, VZW U1, stock TMB U, and I've tried the TLI U1 above and couldn't get it to work. Using google dialer, I input the codes like *#*#27262826#*#* and as soon as I type the last star it just disappears and nothing pops up. I tried with T-Mobile and Verizon sim.
Click to expand...
Click to collapse
Dialer codes usually don't work on VZW firmware, whether U or U1. But they almost always work on TMB and all others.
Have you tried *#06# ?

Question Samkey credits

Anyone has SamKey credits? I'm trying to change my CSC from ZTO to INS to get access to the Indian Beta program, but Samfw didn't work for me. I would be very glad if someone could help me

use SamFw_FRP_Tool_v3.1 for free to change CSC

guimarcio97 said:
Anyone has SamKey credits? I'm trying to change my CSC from ZTO to NIS to get access to the Indian Beta program, but Samfw didn't work for me. I would be very glad if someone could help me
Click to expand...
Click to collapse
There is no NIS CSC, may be you mean INS (India)?
P.S.
Indian is a person form India.

ChoSmile said:
There is no NIS CSC, may be you mean INS (India)?
P.S.
Indian is a person form India.
Click to expand...
Click to collapse
Yes, INS CSC, sorry. And Indian is also a nationality, which is the meaning I tried to use in that sentence

guimarcio97 said:
Yes, INS CSC, sorry. And Indian is also a nationality, which is the meaning I tried to use in that sentence
Click to expand...
Click to collapse
You won't be able to enroll beta by just changing CSC, you also needs SIM from Indian operator.

dr.ketan said:
You won't be able to enroll beta by just changing CSC, you also needs SIM from Indian operator.
Click to expand...
Click to collapse
No India SIM was used (in my experience with SamFW and Samkey, before there was a different method gor CSC change with foreign SIM but it was fix by Samsung August 2019).

guimarcio97 said:
Yes, INS CSC, sorry. And Indian is also a nationality, which is the meaning I tried to use in that sentence
Click to expand...
Click to collapse
Samkey and SamFW use same method, so result will be the same.
I have a similar problem to switch CSC on a friend's A52s to INS.
I deside to tried with ODIN and download desired INS CSC FW via Frija.
Update (even same same FW as currently on device) with BL, AP, CP and HOME_CSC (not CSC_) files, so data will remain.
Then CSC change with SamFW works.
P.S.
No India SIM was used (in my experience with SamFW and Samkey, before there was a different method gor CSC change with foreign SIM but it was fix by Samsung August 2019).
Keep in mind that INS sent 1 sms via every new card, so you can block these numebes in advance via Phone > (dos) > Settings > Block numbers
+919560345888
+918424098931
+919176905802

guimarcio97 said:
Yes, INS CSC, sorry. And Indian is also a nationality, which is the meaning I tried to use in that sentence
Click to expand...
Click to collapse
Samkey and SamFW use same method, so result will be the same.
I have a similar problem to switch CSC on a friend's A52s to INS.
I deside to tried with ODIN and download desired INS CSC FW via Frija.
Update (even same same FW as currently on device) with BL, AP, CP and HOME_CSC (not CSC_) files, so data will remain.
Then CSC change with SamFW works.
P.S.
No India SIM was used (in my experience with SamFW and Samkey, before there was a different method gor CSC change with foreign SIM but it was fix by Samsung August 2019).
Keep in mind that INS sent 1 sms via every new card, so you can block these numebes in advance via Phone > (dos) > Settings > Block numbers
+919560345888
+918424098931
+919176905802

ChoSmile said:
No India SIM was used (in my experience with SamFW and Samkey, before there was a different method gor CSC change with foreign SIM but it was fix by Samsung August 2019).
Click to expand...
Click to collapse
It was not a bug that samsung needed to fix. It is intended to enroll indian users only as update targeted for India
If you read discussion here, you can find, simply changing CSC didn't worked to enroll for beta programme.
Myself from India only so i haven't personally needed to change CSC though.

dr.ketan said:
It was not a bug that samsung needed to fix. It is intended to enroll indian users only as update targeted for India
If you read discussion here, you can find, simply changing CSC didn't worked to enroll for beta programme.
Myself from India only so i haven't personally needed to change CSC though.
Click to expand...
Click to collapse
Ok.
Misunderstanding from my side.
To change CSC - no SIM needed.
To switch to beta program - SIM is needed. Maybe eSIM will be enough to do the trick? $5 https://www.airalo.com/india-esim

ChoSmile said:
Ok.
Misunderstanding from my side.
To change CSC - no SIM needed.
To switch to beta program - SIM is needed. Maybe eSIM will be enough to do the trick? $5 https://www.airalo.com/india-esim
Click to expand...
Click to collapse
Yes, to change CSC No indian SIM needed, nor I said. OP as well I have said specifically about "Enrolling/Accessing Indian Beta Programme"
Sorry, No Idea if e-SIM working or not, haven't read about it so can't confirm.
ChoSmile said:
P.S.
Indian is a person form India.
Click to expand...
Click to collapse
PS : Indian doesn't only mean person from india, It is relating to India, or its people, customs, or languages.

This is what i'm trying to do but in UK. I'm currently on EE on my s22 ultra and I have tried a way to enroll to beta program.
If i change csc to BTU it will change automatically to EUX but not a full change because i still have the operator coding EVR. All i get after reflashing csc is EUX/-/EUX/EVR and no ota updates. From what i have reed Samsung has changed BTU with EUX for faster updates at least for S22 Ultra.

ChoSmile said:
Samkey and SamFW use same method, so result will be the same.
I have a similar problem to switch CSC on a friend's A52s to INS.
I deside to tried with ODIN and download desired INS CSC FW via Frija.
Update (even same same FW as currently on device) with BL, AP, CP and HOME_CSC (not CSC_) files, so data will remain.
Then CSC change with SamFW works.
P.S.
No India SIM was used (in my experience with SamFW and Samkey, before there was a different method gor CSC change with foreign SIM but it was fix by Samsung August 2019).
Keep in mind that INS sent 1 sms via every new card, so you can block these numebes in advance via Phone > (dos) > Settings > Block numbers
+919560345888
+918424098931
+919176905802
Click to expand...
Click to collapse
so when you tried to change csc first using Samfw before flashing these files it did not work? but when you flashed these files and then changed csc it worked ?

Mem_0 said:
so when you tried to change csc first using Samfw before flashing these files it did not work? but when you flashed these files and then changed csc it worked ?
Click to expand...
Click to collapse
On A52s - yes.

ChoSmile said:
On A52s - yes.
Click to expand...
Click to collapse
https://forum.xda-developers.com/t/ktc-to-koo-for-korean-variant.4486127/
this is my issue that I faced with S22U, if you can kindly check that.
some people managed to change csc using samfw with no issues, but could not find anyone who changed the Korean Variant S908N from KTC to KOO.
So do you suggest to try your steps ?

Mem_0 said:
https://forum.xda-developers.com/t/ktc-to-koo-for-korean-variant.4486127/
this is my issue that I faced with S22U, if you can kindly check that.
some people managed to change csc using samfw with no issues, but could not find anyone who changed the Korean Variant S908N from KTC to KOO.
So do you suggest to try your steps ?
Click to expand...
Click to collapse
KTC and KOO are in N model, so you can try.
The firwares are original.
If your device is network locked to sim cards of your oprator - it may not work, but you can flash back to KTC.

ChoSmile said:
KTC and KOO are in N model, so you can try.
The firwares are original.
If your device is network locked to sim cards of your oprator - it may not work, but you can flash back to KTC.
Click to expand...
Click to collapse
no the phone is not locked to a sim.
right now I'm outside of Korea and I'm using the phone with a non Korean provider and it is working fine.
I'm just trying to change csc to be able to remove the ktc bloatware and settings from the device.
Anyways so i will need to use Odin to flash these files : BL, AP, CP and HOME_CSC (not CSC_) files.
then after that the phone will restart then I change csc with samfw?

guimarcio97 said:
Anyone has SamKey credits? I'm trying to change my CSC from ZTO to INS to get access to the Indian Beta program, but Samfw didn't work for me. I would be very glad if someone could help me
Click to expand...
Click to collapse
ZTO here too (Brazil of course). Why don't you install INS firmware under ZTO (using the update from 01/08 that is the same here and HOME_CSC to keep your data unmodified)?
After that, install the beta update through ADB or Alliance. I did that and worked like a charm.

Mem_0 said:
no the phone is not locked to a sim.
right now I'm outside of Korea and I'm using the phone with a non Korean provider and it is working fine.
I'm just trying to change csc to be able to remove the ktc bloatware and settings from the device.
Anyways so i will need to use Odin to flash these files : BL, AP, CP and HOME_CSC (not CSC_) files.
then after that the phone will restart then I change csc with samfw?
Click to expand...
Click to collapse
P.S.
Another friend with A13 (SM-A137F) EUX could not change at beginning.
Flash with EGY and then changed successfully to EGY with call recording.

ChoSmile said:
P.S.
Another friend with A13 (SM-A137F) EUX could not change at beginning.
Flash with EGY and then changed successfully to EGY with call recording.
Click to expand...
Click to collapse
I just checked Samfirm and for A13, EUX and EGY belong to different multiCSC (OXM and OJM)
So it makes sense that u need to flash EGY firmware first to change from OXM to OJM
In his case, all Korean CSCs, including unlocked KOO, belong to OKR multiCSC, and I heard that Samsung specifically blocked CSC changes with Samfw and Samkey in newer phones (S21/S22 etc) for Korea (N model).
:/

How to enable VoLTE on Galaxy S7, SM-G930F

I am a technical guy, but this is my first time hacking into my cell phone firmware, so please be patient with me. I tried to search this forum for the applicable case, but the amount of information is overwhelming. So I am hoping that somebody with the relevant experience could advise me which path to take and could guide me through the process.
Problem description:
Samsung Galaxy S7
SM-G930F (international model), unlocked
CSC: G930FUUB8ETCD (TPA, Panama, don’t ask me why)
My Canadian operator (Videotron) is shutting down their 3G network. I need to enable VoLTE in my phone in order to be able to make voice calls and send SMSes. I have already received a VoLTE-capable SIM and I tested it in a different device. I checked hidden menus in my phone, “VoLTE Provisioned” flag is OFF and greyed out (I am not able to flip it).
This phone model seems to be capable of VoLTE. I found some screenshots of this model in UK (Vodafone) with VoLTE menu present in the regular phone settings (Connections-> Mobile Networks).
I think my best shot to enable VoLTE in my phone is to replace the phone’s firmware to CSC BTU. This firmware is for the same model – SM-G930F, so I expect it to work on my device and hopefully give me the VoLTE option.
Questions:
1. Did anybody have a similar issue with their Galaxy S7 and how did you fix it?
2. I found a number of articles and videos about using Odin to update a Samsung phone to the latest firmware within the same CSC, but I haven’t seen a step-by-step guide about flashing a completely different firmware with a CSC change. Can anybody help me to understand the specifics of that process (which problems to expect, any particular steps to take)?
3. Is there a better CSC option than BTU in my case?
4. A more specific question about Odin. There is an option “Re-Partition”. Some articles recommend this option, some don’t. Does anybody know exactly what this option is used for? Do I need to select it when I am replacing CSC firmware on my device?
5. There seem to be two CSC files in a firmware package – CSC_xxx and HOME_CSC_xxx. Some guides suggest to use HOME_CSC, but the most common recommendation is to use the CSC one. What is the difference between these two files and which one shall I use in my case?
6. I do have a Google account in my phone and I do remember the password for it. Does it mean I do not have to worry about FRP lock? It is my understanding that I will simply enter the password when I am prompted for it after the upgrade and that will be enough to proceed. Or shall I still remove the account before flashing the firmware?
7. Is my understanding correct that by changing CSC firmware I will reset my device and will lose all apps and settings? How much of that will I be able to restore from a backup using SmartSwitch?
8. Do I need to remove the SIM when flashing the firmware? When do I insert the sim back? Will it be an issue if the SIM is from a different country than the CSC? I haven't seen any instructions for that matter.
Thank you in advance for your help. It will be much appreciated.
Felix.

Try the SamFw Tool to change the CSC.
If successful, you can make a donation to developer @Tungtata - author of SamFw Tool.
SamFw Tool 4.7.1 - Remove Samsung FRP one click
Hi Today, we introducing SamFw FRP Tool version 4.7.1 Main function: Remove FRP with one click Change CSC with one click Remove FRP for new se...
samfw.com

ze7zez said:
Try the SamFw Tool to change the CSC.
If successful, you can make a donation to developer @Tungtata - author of SamFw Tool.
SamFw Tool 4.7.1 - Remove Samsung FRP one click
Hi Today, we introducing SamFw FRP Tool version 4.7.1 Main function: Remove FRP with one click Change CSC with one click Remove FRP for new se...
samfw.com
Click to expand...
Click to collapse
Thank you, but before I attempt anything I would like to understand what I need to do in order to change CSC on my device and if that tool does what I need. It is my understanding that there are different ways to change CSC. Some firmwares support multiple CSCs and that seems to be the case with my current firmware. Unfortunately my current firmware does not have any UK CSCs. Those that are supported most probably do not support VoLTE. So the question remains if the tool that you advertise will do what I need.

@Tungtata , do you care to comment on this thread, please? Does your tool replace the firmware or does it switch the same firmware to a different CSC (if multiple CSC exist)?