S21 SM-G991U Binary 4 Firmware

The specific Galaxy S21 SM-G991U U4 Firmware Download Package comes with a Stock ROM of Galaxy S21 SM-G991U U4 Security Patch Level 2021-10-01 (October 1, 2021). This helps you to bypass FRP lock and revert from the root and custom ROM.

Samsung Galaxy S21 SM-G991U Binary 4 Android 11 R United States USC G991USQS4AUIN

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There are various reasons to flash “Stock Firmware on Galaxy S21 SM-G991U U4“. For example, your phone will be stuck or hang on the logo. You want to remove the FRP lock from it.

If you’re going to hard reset your phone and you cannot access the recovery menu. But most of the problems that cause flashing stock ROM are below.

The Advantages Of Galaxy S21 SM-G991U U4 Stock ROM:

  • Flash Stock ROM to solve the boot loop issue
  • Update and Downgrade
  • Unroot or Fix Bugs on the phone
  • To solve the lag or stutter
  • By flashing Stock ROM, you can fix software issues.
  • Revert back to stock to get your warranty.

Pre-requirements:

Galaxy S21 SM-G991U U4 Stock ROM Details:

Model SM-G991U Binary 4 U4, S4, Bit 4
Region  / Country United States / USA
Language Multi-Language / Language
Android version Android 11 R
Operator / Carrier Clean USC (no logo, carrier apps)
PDA G991USQS4AUIN
CSC G991UOYN4AUIN
MODEM CP Version G991USQS4AUIN
product code USC
Build Date 28 Sep 2021
Security Patch Level 2021-10-01 (October 1, 2021)
Size 6.4 GB
[quads id=2]
Download Google Drive Android File Host

How To Install Galaxy S21 SM-G991U U4 Stock Firmware:

Download the Odin and USB Drivers on your PC. Follow the below link to install the firmware using the Odin Flash tool.

How To Flash Samsung Stock Firmware With ODIN

1: Download and Install Samsung USB Driver on your computer. If Samsung USB Driver is already installed on your computer, then Skip this Step.

2: Download and extract the [highlight color=”yellow”]Galaxy S21 SM-G991U U4 Firmware[/highlight] files on your computer.

3: Now, Switch off your Smartphone.

4: After switching off the phone, you need to boot into Download Mode. To 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 the Download mode, you will be able to see a Warning Yellow Triangle Sign. In this situation, you have to press the Volume Up key to continue.

6: Now, Download and open Odin. Then connect your Smartphone to the computer.

7: Once you have connected the Smartphone to the computer, Odin will automatically recognize the device and show the “Added” message at the lower-left panel.

8: Once Odin detects your device, click on the PDA button, and select the Firmware.tar file.

9: Now, click on 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 see, the Pass message in Odin, you can disconnect your Device from the computer.

The flashing process will begin and should take about 10–12 minutes. It may take some time for your device to reboot, but don’t be alarmed.

When your Galaxy S21 SM-G991U U4 finally boots up, you should now be running your desired firmware.

If you want to check that the correct firmware is installed, head to Settings –> About Phone –> Software Information. The firmware number is located under the “Baseband version.”

Disclaimer:

  • Please read and understand the Full Guide before flashing “Galaxy S21 SM-G991U U4 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 information in this guide.
  • Before flashing, Stock ROM must have a 70–80% charge.