The specific Galaxy S21 SM-G991B U4 Firmware Download Package comes with a Stock ROM of Galaxy S21 SM-G991B U4 Security Patch Level 2022-02-01 (February 1, 2022). This helps you to bypass the FRP lock and revert from the root and custom ROM.
There are various reasons to flash “Stock Firmware on Galaxy S21 SM-G991B U4“. For instance, if your phone gets stuck on the logo and you need to remove the FRP lock from it.
If you’re going to reset your phone hard and cannot access the recovery menu. But most of the problems that cause flashing stock ROM are below.
How To Install Galaxy S21 SM-G991B U4 Stock Firmware:
1: Download and Install Samsung USB Driver on your computer. If a Samsung USB Driver is already installed on your computer, then Skip this Step.
2: Download and extract the Galaxy S21 SM-G991B U4 Firmware files on your computer.
3: Now, Switch off your Smartphone.
4: Turn off the phone and 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 appeares . Press Volume Up to proceed.
6: Open Odin. Then, connect your phone to the pc.
7: Once you have connected the Smartphone to the computer, Odin will automatically recognize the device and show the “Added” message on the lower-left panel.
8: Click the PDA button and select the Firmware.tar file.
9: Now, 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 you spot the “Pass” message in Odin, you can unplug your device from the computer.
When your Galaxy S21 SM-G991B U4 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 U4 Firmware“.
Use these instructions at your own risk. We will not be responsible for everything that happens to your device resulting from using information in this guide.