Home Stock Firmware Galaxy S21 Ultra SM-G998B U1 Firmware – G998BXXU1ATLF

Galaxy S21 Ultra SM-G998B U1 Firmware – G998BXXU1ATLF

Galaxy S21 Ultra SM-G998B Binary 1 Firmware

The specific Galaxy S21 Ultra SM-G998B U1 Firmware Download Package comes with a Stock ROM of Galaxy S21 Ultra SM-G998B U1 Security Patch Level  2020-12-01 (1 December 2020). This helps bypass the FRP lock and revert from the root and custom ROM.

Samsung Galaxy S21 Ultra SM-G998B Binary 1 Android 11 R Portugal MEO – G998BXXU1ATLF

There are various reasons to flash “Stock Firmware on Galaxy S21 Ultra SM-G998B U1“. 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 reset your phone hard and you cannot access the recovery menu. But most of the problems that cause flashing stock ROM are below.

The Advantages Of 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 to stock to get your warranty.


Galaxy S21 Ultra SM-G998B U1 Stock ROM Details:

SM-G998B U1 Portugal MEO – G998BXXU1ATLF:

Model SM-G998B Binary 1 U1, S1, Bit 1
Region / Country Portugal
Language Multi-Language
Android version Android 11 R
Operator Clean MEO (without logo, operator apps)
Product code MEO
Build Date Thu, 10 Dec 2020
Security Patch Level 2020-12-01 (1 December 2020)
Size 7.5 GB
Download Google Drive Android File Host

Download Galaxy S21 Ultra SM-G998B U1 Boot.img

boot.img S21 Ultra SM-G998B G998BXXU1ATLF to root on Magisk without TWRP

Download Google Drive

How To Install Galaxy S21 Ultra SM-G998B U1 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 the Samsung USB Driver on your computer. If a Samsung USB Driver is installed on your computer, Skip this Step.

2: Download and extract the [highlight color=”yellow”]Galaxy S21 Ultra SM-G998B U1 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 must 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 in the lower left panel.


8: Once Odin detects your device, 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 on your Phone.

Once the Firmware process is completed, you can see a Green Box with a Pass written 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. Your device may take some time to reboot but don’t be alarmed.

When your Galaxy S21 Ultra SM-G998B finally boots up, you should run 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.”



  • Please read and understand the Full Guide before flashing “Galaxy S21 Ultra SM-G998B U1 Firmware.
  • Use these instructions at your own risk. We will not be responsible for everything that happens to your device resulting from using the information in this guide.
  • Before flashing, Stock ROM must have a 70–80% charge.

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