Step By Step Guide To Update Samsung T-Mobile Galaxy S21 SM-G991U To G991USQU5CVGB Android 12 Stock Firmware
Warning: This tutorial is only for T-Mobile Galaxy S21 SM-G991U. Don’t try this guide on any other Android device. Also, TrueAndroid Team isn’t responsible for any damage caused due to the instruction given on this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in the procedure.
Details of the Firmware :
- Device Name: T-Mobile Galaxy S21
- Model Number: SM-G991U
- Baseband Version: G991USQU5CVGB
- Security Patch Level: 01.07.2022
- Android OS: 11
How To Update T-Mobile Galaxy S21 SM-G991U via OTA
- First of all, make sure you have a stable internet connection (Wi-Fi or data network) on your device.
- Now, go to the Android app drawer and then select Settings.
- Then locate About Device and tap on it.
- Next select Software update from About device screen.
- Then tap on the Update option.
- You should see an update, press OK to download and install. (Remember, download using 3G or network data will incur additional charges to your phone bill!)
- Soon your device will reboot to complete the installation process.
If you see “The latest update have already been installed” message while checking update then your device yet to receive an OTA update. Check back within a few days or jump to the next procedure.
How To Update T-Mobile Galaxy S21 SM-G991U via Kies
- Make sure you have a stable internet connection on your computer.
- Now download and install Samsung Kies on your computer.
- Turn on your device (if it off) and then connect it to a computer with USB cable.
- Run Samsung Kies and wait for it to detect your device.
- You should see a New Firmware Upgrade is available at Samsung Kies home screen.
- Press the Firmware Upgrade button to proceed.
- Follow on-screen instruction and soon you will see your device running upgrade and reboot automatically. Once done, you can disconnect your device from a computer.
Again! If you see “This is the latest firmware” in Samsung Kies, then your device yet to receive the latest update on Kies. It’s a good time to go for manual update instruction located below.
Download G991USQU5CVGB Firmware From Below
[Resumable and Torrent link will only be added when available from trusted source]
Pre Requisites :
Though official firmware restores all existing data but we recommend to back up your data first before proceeding to avoid any uncomfortable situation such as bootloop fix.
1. Backup your device data. You can follow our ultimate backup guide.
2. Make sure your device has at least 40% battery power.
3. You already have USB Driver Installed for T-Mobile Galaxy S21 SM-G991U in your PC. You can always manually download USB driver from our latest USB driver download page.
4. Make sure USB Debugging is enabled otherwise you won’t able to transfer file between PC and mobile. You can follow our USB Debugging enable guide.
Manual Installation Instructions :
As said earlier, manual installation requires Odin tool. You also need the right firmware for your model and the device itself. Below we have put up the tutorial that you can follow and manually flash the latest August 2022 firmware that available for Samsung T-Mobile Galaxy S21 SM-G991U.
Congrats! You just updated your T-Mobile Galaxy S21 SM-G991U to Android 12 firmware. Go to Settings > About device to verify this firmware update.
Fix Boot Loop Issue On T-Mobile Galaxy S21 SM-G991U
If T-Mobile Galaxy S21 SM-G991U stuck at booting animation for more than 10 minutes after the installation process then follows below instructions:
- Go to recovery mode. To do so, first, turn off your T-Mobile Galaxy S21 SM-G991U then press and hold Volume Up, Bixby, and Power button together. Leave the Power button once the phone turns on, while still keeping the Bixby and Volume Up buttons pressed. Let go of the rest of the buttons when you see the Recovery screen.
- Now perform Wipe data/Factory Reset and Wipe Cache Partition task before selecting reboot system now function. In recovery mode use Volume keys to navigate between options and Power key to select the option.
Please note, performing wiping task will erase your device internal memory data and not external SD card data.