Installing OTA updates is the fastest and easiest way because you do not need any third-party tools. To do so, go to Settings -> Software Update -> Check for updates.

This is the program we will use to flash the firmware.ĭownload One UI 3.1 Firmware for the Samsung Galaxy M21īefore you actually go ahead and download the firmware, first try and see if One UI 3.1 is available as an over-the-air update on your phone. Download the latest Samsung USB drivers for the Galaxy M21 ( Download).If your phone gets stuck during the installation process, it will not turn off. Make sure you have at least 60% of battery life left.This will allow your phone to communicate with the computer to install the new firmware. Go to Settings > Developer Options and tap on USB Debugging.Quickly tap 7 times on Build Number to enable Developer Options. Go to Settings > About Phone > Software Information.We are not held responsible if you damage your phone. If you do not do as mentioned, you may end up bricking and damaging your phone to the point of no return. However, please follows the tutorial below very carefully and do not miss any of the steps.

Flashing a stock firmware is a routine procedure on Samsung devices.

How to flash with odin 3.11