Develop Bugs

SM-G960N Unbranded firmware.

Hello to everybody,
I have a Galaxy S9, model SM-G960N and finally the Korean Update to Android 10 arrived, downloaded it from SamMobile (The unbranded version KOO) Flashed it without problems and the phone works as intended. Only it doesn't have KOO as CSC, it has SKC, which has bloatware and it isn't the one I flashed. What gives? Why does it do that, are there any workarounds? Here's what I've tried until now:
Downloaded, and flash numerous times, no result, I don't live in Korea, I don't have a Korean SIM, phone still reports SKC.
Flashing with or without sim card inserted gives the same result.
Can't flash any other CSC, other than Korean ones, Odin spits out an error and it does not even start the flashing process.
Mix and matching different CSC with different firmware's obviously not successful.
Any idea if something can be done about this?
Thank you in advance.

You need to root it and change CSC with phone info app to KOO

numpea said:
You need to root it and change CSC with phone info app to KOO
Click to expand...
Click to collapse
I guess that's the only remaining way, but do you know why it picks SKC instead of KOO, even if the firmware that I'm downloading is KOO.

Korean CSC is a multiCSC even if you download KOO firmware you phone will use SKC that's included in the CSC so there is no different korean csc there's only one that includes the 4 csc codes

i have rooted device but i need multilanguage. ho i can debrand or add orginal languages?

tejanaqkilica said:
Hello to everybody,
I have a Galaxy S9, model SM-G960N and finally the Korean Update to Android 10 arrived, downloaded it from SamMobile (The unbranded version KOO) Flashed it without problems and the phone works as intended. Only it doesn't have KOO as CSC, it has SKC, which has bloatware and it isn't the one I flashed. What gives? Why does it do that, are there any workarounds? Here's what I've tried until now:
Downloaded, and flash numerous times, no result, I don't live in Korea, I don't have a Korean SIM, phone still reports SKC.
Flashing with or without sim card inserted gives the same result.
Can't flash any other CSC, other than Korean ones, Odin spits out an error and it does not even start the flashing process.
Mix and matching different CSC with different firmware's obviously not successful.
Any idea if something can be done about this?
Thank you in advance.
Click to expand...
Click to collapse
i've to face the same thing mine is KTC but it shows SKC. idk what to do after did that always my device is getting overheat

s20+ SM-G985F/DS CSC change issue

I have a SM-G985F/DS that was originally CSC as TPA. I got a 5g sim but it wasn't showing 5G ( i didn't know that the s20+ doesn't even support 5G). Anyways, i figured if i change it to Tmobile CSC that it will be work. TMB wasn't availiable on the CSC so i just picked TMS(slovakia tmobile). it worked but my connection is worse than before and i cant change it back. I used *#272*IEMI# to access the preconfig before but now it won't work (same day, same softwar, same everything). It keeps saying "connection issue or invalid MMI code". I also notice that as it runs the USSD code, the signal drops from 4G to H and then fails as soon as it changes to H. And it is consistent, meaning the USSD is causing that switch in networks or something. I have tried to reflash stock firmware from TPA, MAX, XID but the CSC from the firmware files are not changing the phone's CSC. The software build does reflect with ODIN being successfull and everything but the CSC just wont change. I also hoped that even if the CSC doesn't change with the flashes that the *#272* code works again; however, not the case, it still doesn't work.
I had read that android 10 allows for google phone to access the menu directly but i can't downgrade either. I keep getting bootloader check and kernel check errors on the phone side. I even tried to downgrade in the same order as upgrades. Even the latest previous build didnt work cuz it was binary 6 instead of 7.
Does anyone know how to fix this? Need help to either fix the CSC or how to downgrade to android 10 without issues(bootloader version and kernel version issues).
*samkey does not support my device.

PROBLEM SOLVED (SORT OF): I installed another multi CSC firmware that did not contain TMS and it was able to switch to the default on that firmware. When i switch back to OXM multiCSC firmware it defaulted to French CSC but *#272* code still did not work. But it worked on the other multi CSCfirmware. So looks like i won't be getting TPA back which was getting LTE+ receptions just fine. I switched over to OWA multicsc firmware which contained TCE CSC which is in mexico and uses the tmobile network for roaming. But it still does not use LTE but shows 4.5G which i assume is the same as either 4G+ or LTE. Either way, speed test shows ~40mbps down which is a hell of a lot better than ~5mbps on TMS.

i changed CSC on my G986B using samkey so they support s20 for sure.

Change Active CSC Code to Firmware CSC Code

I just got a galaxy s10+ from a friend who was on Tmoblie so it has the Tmoblie loading screen and apps. I would like to revert it back to the firmware CSC code XAA so I dont have to have the Tmoblie boot screen and apps. He didn't buy it from tmoblie its from an insurance company so I am pretty sure its unlocked. The app "Phone Info" says that Firmware's CSC code is XAA and the active one is TMB. I have tried to put in the *#272*IMEI# code into the phone but it just gives me an error code.
Is there anyway to revert it back to XAA without flashing the phone? Will I void the warranty if i flash the phone with official firmware? Also if I have to flash the phone where do I find XAA firmware as I only saw carrier firmware on SamMoblie.
Thanks for any help and very sorry if this has been posted a thousand times!
Also the phone model is SM-N975U / Galaxy Note10+
Device Type: d2q
Product Name: d2qsq
Bootloader Version: N975USQS6FUF1
CSC Version: N975UOYN6FUF1
Phone is on Android 11

I just flashed the phone and it all worked out. I used these threads to figure out the solution if anyone else is ever interested in how I solved this problem.
Note 10+ N975U carrier universal and unlocked models firmware.
Yep. I'm going to download the files just in case ,but wait a few days to see if anything happens.I'm curious if that was your issue all this time .
forums.androidcentral.com
Odin Files/Guides For S21
Flashing S21 Ultra t-mobile branded to unlocked? Hi Everyone, I am a new samsung owner. I recently got s21 ultra t-mobile branded. It is now network unlocked. But i wanted to have a clean bloat free phone so wanted to have unlocked firmware. As i understand it, i need XAA G998-UA firmware...
forums.androidcentral.com
And I used this very kind user on Androidcentrals help. The context of my question is not needed but I basically asked if I was choosing the correct files.
"Yes use the firmware from frija , you will also need prince comsey patched Odin which download from XDA website, this will factory reset your device for first time , choose XAA as region with model number from unlocked version. (He is refering to the model number SM-N975U1) Put the device in download mode and make sure using a good cable and try 7zip to extract the firmware,odin,frija ...then after extract the the firmware you going take for files Cp/CSC,Bl,Ap and put in corresponding slots in odin and flash"

Question Change CSC from ATT to TMOB in the US?

Hope I could get some good advice from the collective. This week my wife and I changed our carrier from ATT to TMOB. I have a Fold 4 and she a Fold 3. Her went perfectly. Mine, not so much.
Both phones were paid off in advance. No balance for either on ATT.
We started out and got the unlock code from the old ATT carrier for both phones.
We got the code to port the existing telephone numbers from the old carrier ATT.
We established out TMOB account.
When we scanned the QR code for TMOB with the fold 4, it asked for the ATT provided unlock code, which it accepted
Fold 4 rebooted
BAD: The Fold 4 booted with the old ATT logo, not the TMOB logo, but it come up with the esim on TMOB.
Good: The fold 3 booted up with the TMOB logon, and it downloaded all the TMOB bloat, and came up with the esim on TMOB
BAD: On the Fold 4, I cannot seem to get 5G service, because the CSC still points to ATT even though in Settings==>Connections it recognized it is on TMOB
So I supidly flashed the TMOB firmware from Sammy, which was the same Oct 1 security release I had on the phone. I used HOME_CSC to prevent data wiping.
When the Fold 4 rebooted, it went into RECOVERY and told me it required a FACTORY RESET. Would not boot up normally. I tried many times
Performed FACTORY RESET. Restored the phone from SAMMY Cloud.
Same issue - still no 5G service still usnign ATT CSC
Called TMOB and they recommended I remove the esim. Mistrake - then I had no service.
Went to TMOB store and they provided a real SIM so I got service back
But still on the ATT CSC
Told me to go back to ATT, but they say it is unlocked?
Any advice how to force the phone to use the TMOB CSC? Phone is NOT rooted. I know if I root it I can force the change. But I don't want to root it.
Thanks in advance.

Flame Red said:
Hope I could get some good advice from the collective. This week my wife and I changed our carrier from ATT to TMOB. I have a Fold 4 and she a Fold 3. Her went perfectly. Mine, not so much.
Both phones were paid off in advance. No balance for either on ATT.
We started out and got the unlock code from the old ATT carrier for both phones.
We got the code to port the existing telephone numbers from the old carrier ATT.
We established out TMOB account.
When we scanned the QR code for TMOB with the fold 4, it asked for the ATT provided unlock code, which it accepted
Fold 4 rebooted
BAD: The Fold 4 booted with the old ATT logo, not the TMOB logo, but it come up with the esim on TMOB.
Good: The fold 3 booted up with the TMOB logon, and it downloaded all the TMOB bloat, and came up with the esim on TMOB
BAD: On the Fold 4, I cannot seem to get 5G service, because the CSC still points to ATT even though in Settings==>Connections it recognized it is on TMOB
So I supidly flashed the TMOB firmware from Sammy, which was the same Oct 1 security release I had on the phone. I used HOME_CSC to prevent data wiping.
When the Fold 4 rebooted, it went into RECOVERY and told me it required a FACTORY RESET. Would not boot up normally. I tried many times
Performed FACTORY RESET. Restored the phone from SAMMY Cloud.
Same issue - still no 5G service still usnign ATT CSC
Called TMOB and they recommended I remove the esim. Mistrake - then I had no service.
Went to TMOB store and they provided a real SIM so I got service back
But still on the ATT CSC
Told me to go back to ATT, but they say it is unlocked?
Any advice how to force the phone to use the TMOB CSC? Phone is NOT rooted. I know if I root it I can force the change. But I don't want to root it.
Thanks in advance.
Click to expand...
Click to collapse
I would use a patched ODIN and fully flash TMB firmware alongside user_data, it would be a fully factory reset but it will be T-Mobile from the very beginning.

xlylegaman said:
I would use a patched ODIN and fully flash TMB firmware alongside user_data, it would be a fully factory reset but it will be T-Mobile from the very beginning.
Click to expand...
Click to collapse
Ah, I did not use a patched Odin. Perhaps that is where I went wrong?
I did flash User Data.
Thank you for the suggestion!

In case this is helpful to others with the Fold 4 and the wrong CSC, I was able to change from ATT to TMOB using SamFW FRP Tool V3.1 (not the latest, but one that had a working CSC changer).
At the end it said it was rebooting, but it never did and I just manually restarted it and all was good

Flame Red said:
In case this is helpful to others with the Fold 4 and the wrong CSC, I was able to change from ATT to TMOB using SamFW FRP Tool V3.1 (not the latest, but one that had a working CSC changer).
At the end it said it was rebooting, but it never did and I just manually restarted it and all was good
Click to expand...
Click to collapse
Thanks this may help my situation

Can you flash unlock CSC to use T-Mobile on Verizon?

Question AT&T G990U2 to T-Mobile or unbranded firmware help needed

I would appreciate if anyone can point me to the right direction. I have 21FE G990U2 from AT&T, It is unlocked by AT&T.
All I need is working T-Mobile firmware or Samsung (no carrier branding) to flash. I tried multiple versions of U, U1 and U3 firmwares (all matching my current Binary -4) but no success.
I just would like to get rid of ATT bloat. I know I can uninstall it via ADB but I rather have firmware clean of it.
Any suggestion please?
Thanks

So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link by clicking on "Download Samfw server" (G990U2OYN4EWC3, April 2023 update):
Download Galaxy S21 FE 5G SM-G990U2 (TMB) G990U2SQS4EWC3 in Samfw - Samsung firmware download
Galaxy S21 FE 5G SM-G990U2 (TMB - United States) G990U2SQS4EWC3 T(Android 13) samsung firmware download all model, lastest, fast update, completely free and fast speed in Samfw.com ✅
samfw.com
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.

Shuhan44 said:
So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link directly (G990U2OYN4EWC3, April 2023 update):
https://02-samsung.cloud/v2/IxJCDiMnLh8SLAo5IRtBAzwDMyMyCB4lFzssIDs2ByAzMUEgOzEUQDMQMCMBOyw/LiUzJjIXCDkuJC8/NDseIy8xIQYzOAIlPDAVHRIvMz81CAIkMwsuOB42FA00Nh4LNS8vFjIXLA0NFzE/PAMeOTMADTkDAC4mNBEaMCExQQEhJQUUHjFCMTs4BkIjCyI/Iws8MQEWCDAeCw0xCREHOTQbIyshAD4OIQAGLC44Hiw0ER4OMiUzLDIlDSs8AD4fJhsGOg8HCkA8AywnCRc+Di8LBxAzBy4RDxYpKTwkHjUeBylCJgceKTIXIUAJER4OMi8+AwMSMBsBAzY5LwNBJi8IMAQ4MTQUAQMgLyMsHjM7JDMHLzEjJDgAISk8PxQ9NTggQiYbLyUhJCEpMjsHJzw2KSceFy4QIzEvKw8WIAYhFh4JMjAeLDQsLCM0Gy45IzgGQiMDPB0jJCI/ARYFMCMiExM=
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.
Click to expand...
Click to collapse
You are correct - I need T-Mobile (or carrier free) so I can utilize full carrier settings.
Thanks for the link, however above link gives an error when opening the page.
Nevertheless I will look for TMB firmware with CSC: G990U2OYN4EWC3 and post an update here

Flashed that and still has AT&T boot logo and all the apps

h078 said:
Flashed that and still has AT&T boot logo and all the apps
Click to expand...
Click to collapse
Well, I am sure that you have flashed by a Factory reset (Flashed CSC, not Home CSC in ODIN). The boot logo can be changed by rooting your device, also bloatware apps can be deleted via ADB command without rooting.. but you already have mentioned that you prefer not to proceed with those processes. So I am out of suggestions, sorry.
Just for my knowledge, after flashing the TMB firmware, now your settings> About phone> software information> service provider software version: 2nd line shows as TMB/ TMB/ AT&T?
(Also corrected the download link in my previous comment anyway).

Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies

h078 said:
Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies
Click to expand...
Click to collapse
I do not get why the CSC can never be changed, even after flashing the complete firmware... must be an ATT thing!
Anyway, to change the csc only, there is another very quick & easy method. It takes only 2/3 minutes; no flash or factory reset is required. You have to download and install a small software "SamFW Tool" on your pc/laptop (may need to disable the antivirus during the download/install process). Once done, connect the phone and enable USB debugging mode. Open the software, under the ADB tab, click Change CSC, from the dropdown list select TMB and click Change. The phone will restart and CSC "Should" change to TMB/TMB/ATT.
Here is the download link for the software:
https://www.mediafire.com/file/upaiwadhmstm6js/SamFwToolSetup_v4.6.zip/file

That did the trick. I have T-Mobile CSC now
Thanks a lot

h078 said:
That did the trick. I have T-Mobile CSC now
Thanks a lot
Click to expand...
Click to collapse
Great!
But still, that's only one part of the final solution I think. Your target was to replace the complete firmware from ATT to TMB, right? Since the CSC is now changed to TMB, I think you can give it another try via ODIN to install the TMB firmware now (only if you want). I am not confident that it will work now, but still, one last try should not be much of a hassle.

I think that these multi CSC contain all US carrier customizations....When I changed it to TMB it shows TMB/TMB/ATT and loads bootlogo as well as TMobile apps... I guess it is similar as Blackberry used to be back in the days...Depending which carrier SIM used it loaded proper settings from the firmware...

I have flash my METROPCS G990U2 to G990U3,other sim card work fine,but t mobile sim card does not work ,can someone help me?I already change CSC to xxa,but still no internet,I do have sginal bar​