The below method will work on all the newest Xiamoi phones (Redmi Note 3, Xiaomi Mi 5, Mi 4S, Mi Note, Mi 4i, Mi Max, etc.), and rather simple to follow. To reinstall stock firmware on your Xiaomi phone, all you need a computer with drivers for your device installed and Mi Flash Tool.
Read on to know how to flash stock firmware on your Xiaomi Redmi Note 3, Xiaomi Mi 5, Mi 4S, Mi Note, Mi 4i, Mi Max, etc. Note that there is no guaranty that the below method can revert your device to factory state for warranty purpose.
How to Reinstall Stock Firmware on Xiaomi Phones
Download Mi Flash Tool exe file [HERE]
Install the ADB and Fastboot driver on your Windows PC (follow this guide).
Download Global stable ROM for your device [HERE] [You may need to create a free account with Mi Forum (register here) to download the firmware]
Check the downloaded ROM zip file for suffix ‘.tgz’. If it is ‘.gz’, rename it to ‘.tgz’)
Unzip the ROM zip file. You will get many files like flash_all, flash_all.sh etc.
Now, turn off your phone and boot it into fastboot mode (press Volume button and Power button together).
Now, connect your phone to the PC with USB cable
Run the Mi Flash Tool exe file on your computer
Open the ROM unzipped folder and copy its path on the computer. Paste the path on the Address bar in MI Flash tool.
Click the ‘Refresh’ button to connect your phone to Mi Flash tool
Once the phone is connected, click the ‘Flash’ button to start the flashing of MIUI ROM on your phone.
Wait until the process complete (until the progress bar turns green). Your device should automatically boot to the new version. Note: If the above method does not worked for your device, use Mi PC Suite [HERE] to flash ROM. Install Mi PC Suite, boot your phone into fastboot mode, connect it to computer, and select the correct ROM file to flash (source – Mi forum)
