Since CSC change is not possible with latest UI 3.1 update what are options to change CSC

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HI all,

With CSC change not possible using codes with latest UI 3.1 update what are options to change CSC?
For ex. I have SM-N986U unlocked Tmobile device but i changed CSC to ATT as im currently using ATT Prepaid and I'm on latest Apr update for ATT
How can i revert back to Tmobile CSC?
Do i need to flash Tmobile firmware using ODIN by first flashing to U1 firmware then Tmobile firmware or can i directly flash Tmobile latest firmware with Apr update using ODIN?
Will i be able to retain my app and data if I flash Tmobile firmware?
Any help will be appreciated.

Thanks
 
Update:
I was able to change CSC(ATT/ATT/TMB) to TMB/TMB/TMB but it was long and winded way. Just flashing firmware was not enough , need Tmobile sim to install carrier service and change CSC.

I followed the steps below:-
1) Did backup of my device using Smart Switch and removed my ATT sim.
2) Flashed latest T-Mobile firmware( N986USQU2DUC8 ) using instructions from post - https://forum.xda-developers.com/t/ota-and-non-ota-firmware-for-n986u-and-n986u1.4143833/ . Also, downloaded the ODIN (patched version) and T-Mobile firmware from links in the post. Flashed HOME_CSC too.
3) After rebooting phone with new firmware , the boot up screen was still ATT and CSC was still ATT/ATT/TMB.
4)Shut down phone and inserted Tmobile SIM i had lying around.
5) On reboot, i was asked to install Tmobile carrier services and on restart , Tmobile logo came on boot up with CSC changed to TMB/TMB/TMB.
6) Now, i have esim enabled and SIM manager showing up too.
 

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elliwigy

Forum Moderator / Recognized Developer
Staff member
XDA App Taskforce
  • Update:
    I was able to change CSC(ATT/ATT/TMB) to TMB/TMB/TMB but it was long and winded way. Just flashing firmware was not enough , need Tmobile sim to install carrier service and change CSC.

    I followed the steps below:-
    1) Did backup of my device using Smart Switch and removed my ATT sim.
    2) Flashed latest T-Mobile firmware( N986USQU2DUC8 ) using instructions from post - https://forum.xda-developers.com/t/ota-and-non-ota-firmware-for-n986u-and-n986u1.4143833/ . Also, downloaded the ODIN (patched version) and T-Mobile firmware from links in the post. Flashed HOME_CSC too.
    3) After rebooting phone with new firmware , the boot up screen was still ATT and CSC was still ATT/ATT/TMB.
    4)Shut down phone and inserted Tmobile SIM i had lying around.
    5) On reboot, i was asked to install Tmobile carrier services and on restart , Tmobile logo came on boot up with CSC changed to TMB/TMB/TMB.
    6) Now, i have esim enabled and SIM manager showing up too.
    thats the normal process.. that firmware is same for each carrier.. firmware is multi csc which changes based on sim inserted.. shouldnt have to go through all of that really.. i think most ppl who have issues are trying to change csc without a active sim card or on carrier locked devices etc.

    glad u figured it out tho!
     
    thats the normal process.. that firmware is same for each carrier.. firmware is multi csc which changes based on sim inserted.. shouldnt have to go through all of that really.. i think most ppl who have issues are trying to change csc without a active sim card or on carrier locked devices etc.

    glad u figured it out tho!
    Well, the confusion for most ppl who are new to Samsung and CSC, like me , is that we could change CSC with code earlier and now cannot. Didn't have these issues with pixel and iPhone.
     

    elliwigy

    Forum Moderator / Recognized Developer
    Staff member
    XDA App Taskforce
  • Well, the confusion for most ppl who are new to Samsung and CSC, like me , is that we could change CSC with code earlier and now cannot. Didn't have these issues with pixel and iPhone.
    pixel and iphone dont have multi csc like samsung does.. just curious, when were u able to change csc with code earlier if ur new to samsung? lol
     
    pixel and iphone dont have multi csc like samsung does.. just curious, when were u able to change csc with code earlier if ur new to samsung? lol
    Yes, I was able to change CSC to ATT from TMobile, enable all LTE/5G bands before One UI update.Not, sure what u find so funny .
    Yes, I'm aware that there is no CSC concept in pixel or iPhone or any other other manufacturer that I'm aware nor they are crippled in terms of hardware capability from carrier software like Samsung. LTE/5G bands not being enabled , esim not being enabled etc.
     

    elliwigy

    Forum Moderator / Recognized Developer
    Staff member
    XDA App Taskforce
  • Yes, I was able to change CSC to ATT from TMobile, enable all LTE/5G bands before One UI update.Not, sure what u find so funny .
    Yes, I'm aware that there is no CSC concept in pixel or iPhone or any other other manufacturer that I'm aware nor they are crippled in terms of hardware capability from carrier software like Samsung. LTE/5G bands not being enabled , esim not being enabled etc.
    actually other devices are crippled in some cased disabled entirely.. for example u cant get a tmb oneplus 9 pro 5g and use it on verizon to get 5g bcuz vzw 5g bands are disabled in tmb variant..

    its really the carriers to be honest..

    and I say LOL all the time even in normal convo so not actually laughing sometimes, just say it out of habit