Samsung Galaxy S21 5G - SM-G991B Firmware

SM-G991B Firmware flash file – Samsung Galaxy S21 (5G)

SM-G991B firmware download for flash the Samsung Galaxy S21 (5G) device. For most software-related issues fix installing the SM-G991B stock firmware. That is the final solution every one does.

For the firmware repairing of any device including Galaxy S21 (5G), flash files are essential. So if your S21 starts to misbehave like app hanging, freezing, Not responsive to touch it’s the time you should take action. Try soft reset or hard reset in times like this. It will mostly fix the problem. But it’s not permanent. Because it only removes temporary junk and cache files of the device.

Samsung Galaxy S21 (5G) SM-G991B Firmware flash file

Download Samsung derivers first to your PC. Then Odin tool is also necessary for the process. Find the best instruction guide on flashing firmware and follow each guideline cautiously. If the first time is not successful you will not get a Pass message. But don’t worry. Try the whole process again from the beginning. Find below SM-G991B firmware flash files download pages;

Android 12 (S)

Model No: SM-G991B / Device: Galaxy S21 5G
Country: United Kingdom
Carrier Code: BTU
Android: 12 (S)
Download file: Start Download through this link (7.28 GB)

Product Code: XSG
Baseband: XSG G991BXXU5CVDD
Android: 12 (S)
Include 5 File: AP, BL, CP, CSC, HOME_CSC
File Name:
Download File – Start Download Here (7.3GB)

Android 11 (R)

Product Code: XSG
Baseband: XSG G991BXXU3AUDA
Include 5 File: AP, BL, CP, CSC, HOME_CSC
File Name:
Download File – Start Download Here (7 GB)

More Stock Firmware Files: Download Firmware files

But if the device hanging in a boot loop or if it is bricked what should you do? The device warranty might also be voided by now. No worries, you just have to download the G998B flash file from us and flash it on your device. Find above SM-G991B firmware download pages;

Here are some common issues that can occur with your device. The Stock Firmware should be needed when you want to carry out any of the following tasks:

  • Android version Update.
  • Reinstall the official firmware.
  • Unroot Android OS.
  • Fix software issues.
  • Battery draining issues fix.
  • Fix a boot loop error and hanging on the Samsung logo.
  • Solve errors like rebooting continually.
  • Remove malware, virus, and spyware.
  • IMEI issues
  • Fix unknown baseband error and more…

How to Flash Samsung Galaxy S21 (5G) SM-G991B

Before Flashing using SM-G991B Firmware, Prepare those;

  • Firstly, Backup the device data.
  • Then, Download the firmware.
  • Secondly, Download the latest Samsung Odin version.
  • Download Latest USB driver. Then install it.
  • Charge the Battery at least 50%

Time needed: 15 minutes

Read the following Flashing Steps before take action.

  1. Download above SM-G991B Stock firmware on your Windows computer

    You need to find correct firmware, so look the details and get your one.

  2. Odin3 flash tool download on your windows computer

    We have provided you with a reliable source to Odin3 download. Go to that page and get the Odin3 portable software. Do not need to install it.

  3. Now, extract the downloaded ZIP files in a separate folder.

    Always those packages comes in Zip format. So, you need to unzip to get firmware files and the flash tool.

  4. Odin3 folder has EXE file, Open it.

    Open the folder and find “EXE” file. Now it will be open Odin3 software window.

  5. Add Firmware files related slot in the Odin window.

    Add each file to its respective field in Odin3. Use CSC_xxx if you want to do a clean flash or HOME_CSC_xxx if you want to keep your apps and data.
    AP (System & Recovery)
    BL (Bootloader)
    CP (Modem/Radio)
    CSC_xxx (Country/Region/Operator)

  6. Now you need Boot your phone in to “Download Mode”.

    If you don’t know how to turn on this Mode, Follow this video guide;

  7. Then Connect Phone in your computer.

    Odin will recognize your phone, you can see turn blue in left side, BLUE box will show up with the COM port number. So, everything is fine move next step…

  8. Click the START button

    Then, Odin will start the process after hit the Start button. Wait for Odin to say ‘PASS’ in a GREEN box.

  9. Once the flash is complete, your phone will be reboot automatically.

    So, After reboot, you can disconnect your phone from the PC.
    Now It’s all over.

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