Download the latest Galaxy S21 5G SM-G991B/DS Firmware U9 Package, featuring the Security Patch Level from 2024-03-01 (March 1, 2024). This update is essential for bypassing the FRP lock, reverting from root access, and switching back from custom ROMs to the original firmware. Keep your device secure and up-to-date with this crucial download.
Charging: Ensure your mobile is charged to at least 50%.
Computer: A PC or laptop is necessary to perform this installation.
Backing Up Your Android Phone: Before proceeding, back up your device. Visit here for instructions.
Samsung USB Driver: Essential for connectivity, download and install from Samsung’s developer site.
Downloading Odin: For the installation process, download the latest version of Odin from here.
How To Install Stock Firmware:
Download the Galaxy S21 5G SM-G991B/DS Binary 9 Firmware files, then extract them on your computer.
Turn off your smartphone completely.
To enter Download Mode, simultaneously press and hold the Volume Down, Home, and Power buttons for 5-8 seconds until the screen changes.
In Download Mode, a warning sign with a yellow triangle will appear. Press the Volume Up button to continue.
Open Odin on your PC and connect your smartphone via USB.
Odin will display “Added” in the lower-left corner once the device is successfully connected.
Select the Firmware.tar file by clicking on the PDA button in Odin.
Press the Start button in Odin to initiate the firmware flashing process.
The flashing process should be completed within 30-50 seconds.
To verify the installed firmware, navigate to Settings, select About Phone, then Software Information. Locate the firmware number listed as “Baseband version.”
