So you found an unfixable issue, found no use in MIUI, or are trying to troubleshoot a problem and you want to start from scratch to fix possible issues. This guide will help you do just that!

Prerequisites:

• Phone, computer with ADB drivers, USB cable to connect the two
• Mi Flash tool - Download: https://1drv.ms/f/s!AjFrz9WguuzzheNFf4bh6jIje5etPg?e=M7t92c
• Your phone’s respective fastboot ROM file [CAUTION] You will lock the bootloader, DO NOT get the wrong file under any circumstances. This will irreversibly break your phone.

Steps:

• Extract the .tgz (or whatever else format FASTBOOT ROM you have) in advance
• Connect computer to phone via USB
• Open Mi Flash Tool
• Put phone into fastboot
• Download necessary drivers via Mi Flash Tool
• Select the folder that you extracted from the archive
• Select flash_all_lock in the bottom right
• Click flash
• As a sidenote, if there’s an error and it says that a folder is missing, that would be the log folder, make one in the Mi Flash Tool folder. Though with the OneDrive link I’ve included, you should be fine
• Pray
• Once it is done, reboot into MIUI