General Samsung S21, S21+, and S21 Ultra U1 Firmware (Links)

[aimanfaeiz]

I'm using digi.

Alright.. I'll check later with the telco.. thank you for replying.. much appreciated

 

[mapl.ph]

Anyone else who's using AT&T variant that has unlocked n78 5g band?

 

[fr0st420]

FYI latest patched Odin (v3.14.1_3B) is here: https://forum.xda-developers.com/t/patched-odin-3-13-1.3762572/

 

[m_kontaw]

thank you sir I was only 5 days away from temporary unlock expiry date, s21 t-mobile.my question though can OEM be unlocked from now on for root.

 

[theartialmartist]

Anyone successfully flash this onto the 0/Taiwan/Hong Kong variant?

Its a snapdragon as noted, im using an AT&T sim but not getting 5G or wifi calling etc

 

[Macekmaks]

Can somebody tell me how to delete userdata folder when flash U1 firmware. I want all my userdata to delete. In rom folder no userdata file.

Thanks

 

[YoungToaster]

THANK YOU!!!!

 

[erhandavran]

After looking really hard ahead of launch for the U1 S21 Ultra Firmware using Samfirm and Frija, I couldn't find the US XAA firmware. Well I finally got a hold of it ahead of launch. You can use this firmware to flash any carrier branded S21, S21+, and S21 Ultra to U1 after receiving your device using Odin. Attached are the Google Drive links I've uploaded for your convenience. Links will be updated on a monthly basis for simplicity. Below is a simple guide on to flash this.

Step 1: Download patched Odin and Firmware for the model that corresponds to your device's model number
Patched Odin link:

odin.rar

drive.google.com

Download patched Odin and your phones firmware to an area on your computer that will be easy to access.

If you do not have a program that can open rar files, then Winrar is a great program. Download link here

https://www.win-rar.com/fileadmin/winrar-versions/winrar/winrar-x64-601.exe

Step 2: Download Samsung Smart Switch and make a complete backup of your entire device. Data will be wiped during this process, so make sure you have a complete backup.
If Samsung Smart Switch says your device has an update, DO NOT UPDATE USING SMART SWITCH!
Windows Link here: https://www.samsung.com/global/download/smartswitchwin/

Step 3: Once your device is done backing up, Power off your device and put your device in download mode by pressing the Volume down button and power button at the same time. If you have done it correctly, your device should show this screen.
View attachment 5298505
Image Credit: Technastic.com

Step 4: Connect your device to your computer and open up Odin.

Step 5: Once Odin is opened, make sure your device is showing as connected, then select AP, and find your firmware file that you had extracted earlier, and select the one that says AP_(Your phones model), and do the same for every other one. So BL for BL, CP for CP, CSC for CSC, and USERDATA for USERDATA. Make sure you select the HOME CSC.

Step 6: Click start. It will start to flash your U1 Firmware. Take a Tea break or something. Once its finished, it will automatically reboot.

Step 7: Once device reboots, sign into your Gmail account you used previously, as well as your Samsung account. Once its at the home screen, restore the backup you made using Smart Switch and then once that completes, sign into all your apps. Your done. All OTA's now ill be XAA Samsung OTA's, not carrier branded ones.

Step 8: Profit>?


(S21 Firmware) SM-G991U1 Firmware - https://drive.google.com/file/d/1TdN9YZwTfi1O7UCqMU5TsgzkBlAw5le2/view?usp=sharing
(S21+ 5G Firmware) SM-G996U1 Firmware - https://drive.google.com/file/d/1nsi_zZuxQok8J_MOdqDaroUz5TdG6kmU/view?usp=sharing
(S21 Ultra Firmware) SM-G998U1 Firmware - https://drive.google.com/file/d/1Nwd_yEisW-AxnAUJAJBbJ1gQe91ED0z2/view?usp=sharing

Enjoy and Happy Flashing
Paypal Donation Link

Donate

www.paypal.com

Questions and Answers

Will this work for the Exynos version of the S21?
No The provided firmware files are for the Snapdragon version. This might be compatible with the HK Snapdragon version, but I am not sure.

Help, Odin won't flash, gives me an error.
Respond in the comments below, and I'm sure we can get this to work.

Will this unlock my phone from my carrier?
No. If your device is locked before you flash this, it will be locked after you flash it. This is to remove carrier bloat and ensure all further updates will come from Samsung instead of your carrier. If you flash it before you unlock, you can still unlock your device as normal.

I have bootloader unlocked my device, will this relock my bootloader?
Yes. This includes the V2 bootloader for the S21 series, and as a result, if you flash this, you will lose your unlock token.

Updated for Feb 2022 Security patches.

this firewire a11 or a12? tnks

 

[cjegan2008]

Anyone successfully flash this onto the 0/Taiwan/Hong Kong variant?

Its a snapdragon as noted, im using an AT&T sim but not getting 5G or wifi calling etc

This won't work for international variants of the S21. Even though it's a snapdragon SOC, it's not the US version.

 

[cjegan2008]

Do we need USERDATA to convert? Will there be any issues?

Yes you need USER DATA to convert.

 

[cjegan2008]

Hello, could someone please tell me, is it possible to flash g998u1 with Thailand firmware, Chinese etc.??

No, it is not possible.

 

[cjegan2008]

Hello. Admittendly I am a newbie here (as the badge to the left says.) I have been reading a few posts about flashing my S21 Ultra from Verizon to Unlocked in an attempt to get the calling and texting feature enabled. I realize this will not unlock my simcard and that is still controlled by Verizon, but will flashing my phone to the Unlocked firmware allow me to use the calling and texting feature?

Thank you.

Yes it will

 

[cjegan2008]

firmware s21 + 5g 996b itv where to download it

Frija

 

[cjegan2008]

Same My SIM problem, Is this version useful or does it cause problems? Does it allow dual SIM on AT&T? I am wondering if that will be possible.

I currently use Dual SIM on AT&T. The physical SIM I use for AT&T and eSIM for T-mobile.

 

[cjegan2008]

Same My SIM problem, Is this version useful or does it cause problems? Does it allow dual SIM on AT&T? I am wondering if that will be possible.

It does allow dual SIM.

 

[cjegan2008]

Can somebody tell me how to delete userdata folder when flash U1 firmware. I want all my userdata to delete. In rom folder no userdata file.

Thanks

Use the USERDATA File, It will format USER DATA

 

[cjegan2008]

Files will be updated today for July 2022 security updates.

 

[cjegan2008]

Links have been updated for July 2022 Security Patches.

 

[robnitro]

Anyone on the July update can test this Google play app?
It allows for choosing lte and or 5g bands.

Network Mode Samsung - Apps on Google Play

Network Mode / Band Selection / LTE ONLY for Samsung

play.google.com

When I had the June and July U updates, this functionality was removed and the app didn't work.
If U1 still has it, I may switch over.

 

[cjegan2008]

Anyone on the July update can test this Google play app?
It allows for choosing lte and or 5g bands.

Network Mode Samsung - Apps on Google Play

Network Mode / Band Selection / LTE ONLY for Samsung

play.google.com

When I had the June and July U updates, this functionality was removed and the app didn't work.
If U1 still has it, I may switch over.

Tried it, it doesn't work on U1 for the July security patches. The app will probably need to be updated.