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Flashing G920A to G920T

Hi all,
I bought the Galaxy S6 from AT&T when it came out, but switched over to T-Mobile from AT&T last year. Because of this, I have been unable to get any updates and have been stuck on Android 6.0 when the current release is android 7.0, so I've been thinking of flashing my phone. I was curious as to whether I'm able to flash my G920A with Tmobile's G920T rom? Would it work? And if so, after I flash it, would I be able to receive updates normally from T-mobile's servers, as I'm currently using a T-mobile sim, or would I have to flash every subsequent update?
Thanks

Doubtful, since AT&T has a locked bootloader. If the bootloader was unlocked you might be able to try.

hiilikepie said:
Hi all,
I bought the Galaxy S6 from AT&T when it came out, but switched over to T-Mobile from AT&T last year. Because of this, I have been unable to get any updates and have been stuck on Android 6.0 when the current release is android 7.0, so I've been thinking of flashing my phone. I was curious as to whether I'm able to flash my G920A with Tmobile's G920T rom? Would it work? And if so, after I flash it, would I be able to receive updates normally from T-mobile's servers, as I'm currently using a T-mobile sim, or would I have to flash every subsequent update?
Thanks
Click to expand...
Click to collapse
You cannot flash a G920T firmware on a G920A. First off, Odin won't let you because the G920T firmware is only signed to be flashed on the G920T.
And even if you somehow rooted and used FlashFire to force the firmware onto your device, the firmware would brick the device, and without a USB jig or SD card port, the brick would be permanent.

hiilikepie said:
Hi all,
I bought the Galaxy S6 from AT&T when it came out, but switched over to T-Mobile from AT&T last year. Because of this, I have been unable to get any updates and have been stuck on Android 6.0 when the current release is android 7.0, so I've been thinking of flashing my phone. I was curious as to whether I'm able to flash my G920A with Tmobile's G920T rom? Would it work? And if so, after I flash it, would I be able to receive updates normally from T-mobile's servers, as I'm currently using a T-mobile sim, or would I have to flash every subsequent update?
Thanks
Click to expand...
Click to collapse
I too am seeking answers on this as I have an SM-920A I brought over to t-mobile. Unlocked the phone, installed the t-mobile SIM and the phone works fine, except, it still has all the old ATT apps I no longer need or desire to be there AND without the T-Mobile apps installed, I cannot use their LTE Signal Booster. Is there any way I can install these t-mobile apps that would have come with the SM-920T load?

BWMcAMA said:
I too am seeking answers on this as I have an SM-920A I brought over to t-mobile. Unlocked the phone, installed the t-mobile SIM and the phone works fine, except, it still has all the old ATT apps I no longer need or desire to be there AND without the T-Mobile apps installed, I cannot use their LTE Signal Booster. Is there any way I can install these t-mobile apps that would have come with the SM-920T load?
Click to expand...
Click to collapse
https://www.google.com/amp/s/forum....t-samsung-g920a-s6-g925a-s7edge-t3564637/amp/
Just do this and remove the AT&T apps you don't want completely.
Sent from my SM-G955U using Tapatalk

So, what can be done -- if anything--to solve this issue?

-wrong

install Verizon "Advanced Calling" on G973U1 firmware?

Verizon is my carrier and I am upgrading to an S10 from an S7. I bought a new S10 loaded with the first Verizon version of Android 10, G973USQS2CSL1. I want to get rid of the bloatware and go back to Android 9. My plan is to flash the U1 firmware, G973U1UES2BSIV, using all 4 of the U1 files. Then flash the Verizon CSC file from this firmware, G973USQS2BSIV, so I can get the "Advanced Calling" for Verizon. I was going to try to do that on my S7 but never got around to it. Here's a thread I created on the S7 forum that said that's what I would need to do to run the unbranded firmware on the S7 but also have Verizon's Advanced Calling (wifi calling, video call, hd calling). https://forum.xda-developers.com/galaxy-s7/help/install-verizon-advanced-calling-g930u-t3997525
I noticed the S10 Verizon firmware now has a 5th file, a USERDATA file. Will I need to also flash that?
I wanted to point out, my new phone is currently locked, but Verizon automatically unlocks it after 60 days. https://www.verizon.com/about/consumer-safety/device-unlocking-policy Will it be a problem if I flash the unbranded firmware on a phone that is still locked? Since Verizon is my carrier, I will obviously be using a Verizon SIM card.
Thank for the help.

You can flash any firmware to your phone as long as it's for the U or U1 models as the "U" means Universal. Bought a phone from AT&T? Flash the Sprint or T-mobile firmware without issues. Same for Verizon and other U.S. carriers firmware.
Flashing the unbranded firmware will get rid of the bloatware, but will also get rid of other features like wifi calling, advanced calling, etc. The user data file is just all of Verizon's bloatware and info crap.
As for going back to Android 9, you can do that as long as you're still on the v2 bootloader. If you've upgraded to the v3 bootloader via OTA, you won't be able to return to Android 9.

StoneyJSG said:
You can flash any firmware to your phone as long as it's for the U or U1 models as the "U" means Universal. Bought a phone from AT&T? Flash the Sprint or T-mobile firmware without issues. Same for Verizon and other U.S. carriers firmware.
Flashing the unbranded firmware will get rid of the bloatware, but will also get rid of other features like wifi calling, advanced calling, etc. The user data file is just all of Verizon's bloatware and info crap.
As for going back to Android 9, you can do that as long as you're still on the v2 bootloader. If you've upgraded to the v3 bootloader via OTA, you won't be able to return to Android 9.
Click to expand...
Click to collapse
I'm on v2 bootloader. Have you heard of flashing the VZW CSC file on top of the U1 unbranded firmware? Apparently people have done it on older devices, like the S7, that only took the 4 files when flashing. I'm trying to run unbranded firmware but still have the Verizon Advanced Calling (wifi calling, HD calling, video call).

Okay if you're on bootloader v2 then you can go back to Android 9. I haven't heard of flashing the carrier CSC file with the unbranded U1 firmware. It might work or might also brick your phone.

Bought AT&T Unlocked Phone, looking for correct ROM

I'm currently living in Japan, but will be moving back to the US in a couple months, so I recently bought a refurbished Galaxy S20 FE 5g that claimed to be unlocked from the US and had it shipped to Japan.
It works fine with my Japanese sim, but came with AT&T bloatware installed and the model number is still SM-G781U. To my understanding, an unlocked phone should have a '1' after this, signifying that it's unlocked. Because of this, I don't get OTA updated and am still stick on Android 10 and One UI 2.5. So I figured I'd learn how to flash it and do that. It says the CSC is G781UOYN1ATIG, but then when I go to Service Provider it says ATT/ATT/ATT.
Could I just flash the firmware for the SM-G781U1, CSC: XAA onto it and be able to have a fully unlocked and updated phone? Sorry I'm a bit new to this and don't want to brick my phone. Thanks!

I did the opposite (from SM-G781U1 to SM-G781U) and worked with no problems. I needed ATT Wi-Fi calling that worked only with the ATT firmware when I was on Android 10. I suggest to do a factory reset when switching between branded and unbranded but (in theory) you should keep your phone data if you flash the HOME_CSC file.

Question Carrier csc wont change after flashing U1 firmware

I have a verizon branded s21 ultra. Switched to tmobile and flashed the u1 firmware. Flash went fine, rebooted, put in tmobile sim, but still shows VZW/VZW/VZW. Cannot receive tmobile ota's. Model number says U1. Any help is appreciated.
It should show TMB/TMB/VZW correct?

I remember going through a similar issue on A20. The steps are probably the same https://www.droidwin.com/change-csc-codes-samsung/
Even if you can't change the CSC, you can always flash the Tmobile rom (zip) using SamFirm and install them manually https://www.xda-developers.com/download-samsung-updates-free-tools/

Tried flashing tmobile software using Odin. Booted up to verizon splash screen and still showing VZW/VZW/ VZW

Mindripper72 said:
Tried flashing tmobile software using Odin. Booted up to verizon splash screen and still showing VZW/VZW/ VZW
Click to expand...
Click to collapse
SM-G998U1 isn't the model number for the TMobile Branded device, it's the Unlocked variant. You can download the TMobile firmware here. You may not receive TMobile's OTA's even after you flash TMO Firmware since your Primary CSC will always be VZW.
Download Samsung Galaxy S21 Ultra SM-G998U TMB USA (T-Mobile) firmware
All Samsung firmwares for Galaxy S21 Ultra in USA (T-Mobile) with model code SM-G998U. We offer free and fast download options. Check them out now.
www.sammobile.com

When I flashed the TMB firmware, it still boots to Verizon splash screen and still shows VZW/VZW/VZW even though there is a tmobile sim installed

Try changing the CSC to TMO by entering the following code on the Dialer TouchPad. *#272*YOURIMEINUMBER# In the string replace YOURIMEINUMBER with your actual IMEI Number. You may see a list of regional CSC's. Select TMO then select install. I'm not sure this method still works on the Verizon device or after the latest updates but it's worth a try.

Who is running the Verizon firmware on an unlocked device?

I have an unlocked Pixel 5 that I'm using on Verizon. I'm updated to the November .003 firmware, but I (and a few others) have been getting update notifications. I noticed that there is an .002 firmware for Verizon and Verizon MVNO's; I'm wondering if anyone happens to be running this firmware, and whether you've noticed any difference.

I've got an unlocked P5 on Verizon with .002. I normally flash the Verizon images if they are available. Never thought about it otherwise to be honest. No problems since I flashed it last week.

I already was on A12 and got the .002.A1 Verizon update yesterday. Before, I was on the .003 build and I have nothing to do with Verizon. Though, everything seems to work normal.

I'm running the Verizon firmware on an unlocked device

I got the Verizon firmware on my device recently by accident. Still reboots randomly.