In this tutorial, I will show you how to easily unroot your Samsung Galaxy S8 or S8 Plus with stock firmware just in case something goes wrong or you simply want to put official Samsung software back on your phone. Remember, flashing stock firmware WILL ERASE EVERYTHING on your phone so please MAKE A BACKUP of everything before preceding.
Step 1. Reboot into download mode by powering off then holding together Volume Down, Bixby, and Power buttons together until you see a warning screen pop up. Hit Volume Up to enter download mode and connect to your computer via USB cable.
Step 2. Download the files needed:
Download stock firmware:
Download ODIN – Link
Download Samsung USB Windows Drivers for S8 & S8 Plus – Link
Step 3. Unzip ODIN and stock firmware then run the ODIN EXE program.
Step 4. If you do not see a blue highlighted box, run the Samsung USB Windows Drivers program to install drivers.
Step 5. Choose BP, AP, and CP and select the appropriate firmware files.
Step 6. Hit Start and that’s it!