Galaxy S21 SM-G991B U3 Firmware – Android 11 R
The specific Galaxy S21 SM-G991B U3 Firmware Download Package comes with a Stock ROM of Galaxy S21 SM-G991B U3 Security Patch Level 2021-12-01 (1 December 2021). This helps you to bypass the FRP lock and revert from the root and custom ROM.
Samsung Galaxy S21 SM-G991B Binary 3 Android 11 R Brazil ZTO – G991BXXU3AUHB
There are various reasons to flash “Stock Firmware on Galaxy S21 SM-G991B U3“. For instance, if your phone gets stuck on the logo and you need to remove the FRP lock from it.
The Advantages Of Stock ROM:
- Fix boot loop issue
- Update and Downgrade
- Unroot or Fix Bugs
- To solve the lag or stutter
- Fix software issues.
- Revert to stock firmware
Pre-requirements:
- Supported Phone: Galaxy S21 SM-G991B U3
- Ensure it’s at least 50% charged.
- Laptop or PC.
- Backup Android Phone
- Download and install the Samsung USB Driver
- Download Odin’s Latest version
Galaxy S21 SM-G991B U3 Stock ROM Details:
SM-G991B U3 Brazil ZTO – G991BXXU3AUHB:
Model | SM-G991B Binary 3 U3, S3, Bit 3 |
Region / Country | Brazil |
Language | Multi-Language |
Android version | Android 11 R |
Operator / Carrier | Clean ZTO (no logo, carrier apps) |
PDA | G991BXXU3AUHB |
CSC | G991BOWO3AUHB |
product code | ZTO |
Build Date | 2021-08-19 |
Security Patch Level | 2021-08-01 (August 1, 2021) |
Size | 6.3 GB |
Download | Google Drive | Android File Host |
Stock ROM (SM-G991B) Full Firmware All File Fix Samsung S21 5G
PDA | Android | Size |
G991BXXU3BUK8-G991BOXM3BUK8-XXV | 11 | 6,4G |
G991BXXS3AUJ7-G991BOXM3AUIE-XXV | 12 | 6,4G |
G991BXXU3AUDA-G991BOXM3AUDA-XSG | 11 | 6,4G |
How To Install Galaxy S21 SM-G991B U3 Stock Firmware:
1: Download and Install the Samsung USB Driver on your computer.
2: Download and extract the Galaxy S21 SM-G991B U3 Firmware files on your computer.
3: Now, Switch off your Smartphone.
4: Boot into Download Mode.
Press and hold Volume Down, Home and Power button at the same time for 5-8 seconds until download mode is active.
5: In Download mode, a Warning Yellow Triangle Sign will appear. simply press the Volume Up key.
6: Open Odin. Then, connect your phone to the pc.
7: Odin will detect the device and show the “Added message in the lower-left panel.”.
8: Once Odin detects your device, click on the PDA button and select the Firmware.tar file.
9: Click the Start button in Odin to begin the Flashing.
10: Flashing usually takes 30-50 seconds to complete the process on your Phone.
Once the Firmware process is completed, you will be able to see a Green Box with Pass written on it in Odin. During this process, the Smartphone will reboot automatically.
Once you spot the “Pass” message in Odin, you can unplug your device from the computer.
When your Galaxy S21 SM-G991B U3 finally boots up, you should now be running your desired firmware.
To verify the installed firmware, go to Settings –> About Phone –> Software Information. Check the firmware number under “Baseband version.”
Disclaimer:
- Read and understand the Full Guide before flashing.”Galaxy S21 SM-G991B U3 Firmware“.
- Use these instructions at your own risk. We will not be responsible for everything that happens to your device resulting from the use of the information in this guide.
- Phone must have a 70–80% charge.