How to Install Stock ROM on Samsung SM-G991B (Firmware Guide)

In this tutorial, we will guide you on how to install the Samsung SM-G991B (Galaxy S21) flash file using the Samsung flash tool (also known as the ODIN flash tool). On this page, you will find the official stock firmware file for the Samsung Galaxy S21 SM-G991B, drivers, and flash tool.

By flashing the Stock ROM file, you can always fix the device software issue such as boot loop, lag, soft brick or hard brick, remove pattern lock, FRP lock, and many more.

Samsung Galaxy S21 SM-G991B Firmware Flash Files:

Steps to Flash Stock ROM File on Galaxy S21 SM-G991B

Before we get straight to the steps to Install Stock Firmware on your Samsung Galaxy S21, let us take a look at the pre-requirements first.

Pre-Requirements: 

• This Guide is for Samsung Galaxy S21 SM-G991B
• You need a Windows PC/Laptop and a USB cable to flash the firmware.
• Charge your device with a minimum of 50% battery backup.
• You have to download the latest Samsung USB Drivers and install them on your PC.
• Make sure that you have ODIN Software installed on your PC.
• Take a backup of your device (No Root) before doing anything.

Now, let’s take a look at Steps to flash Stock ROM on Samsung Galaxy S21.

1. Download the Samsung SM-G991B firmware flash file
2. Extract the contents of the firmware flash file zip.
3. Launch the ODIN application
4. Load the firmware files in their appropriate section
5. Once you have loaded, now connect your phone to the computer (make sure to boot your device into download mode)
6. Notice that the CO port will light up on Odin once you connect your phone.
7. Click the Start button to install the firmware on your Samsung device.
8. That’s it! You will see a PASS message once the installation is complete.

Follow Complete Guidelines

Check out our full depth video guide as well.

Video Tutorial To Install Firmware

We hope that this guide will be helpful to you. If in case, you’re facing any issues, feel free to ask in the comments below.