How To Revert Back/Downgrade Mi3 To Miui v5 Stable From Miui v6 :
- Backup your data from your device.
- Reboot your Mi3 into recovery mode by PRESSING POWER + Volume UP Key Simultaneously
- Now go to WIPE DATA setting and wipe CACHE, USER DATA and SD DATA. These will remove everything on your Mi3
- Now install Mi Flash tool in your PC
- Extract your downloaded Fastboot stable rom (e.g. C:/ Roms)
- Open Mi Flash Tool and then select browse and select the unzipped folder of the fastboot rom and then click flash button in Miflash.
- On the BROWSE Tab menu select ADVANCED and then browse FAST BOOT SCRIPT from the extracted folder.
- Power Off your device from recovery and then Press POWER BUTTON + Volume Down Key. This will enter your device into FASTBOOT Mode.
- Now connect your device to PC via USB and PRESS Flash Button.
- You have done flashing MiUi v5 on your Mi3.