1. Copy latest MIUI9 xiaomi.eu rom.zip to internal storage
2. Install latest official
TWRP recovery in fastboot mode using ADB with below command:
Code:
fastboot flash recovery twrp.img
...and then boot to TWRP recovery with below command:
3. Install latest MIUI9 xiaomi.eu rom.zip in TWRP recovery
4. Format Data in TWRP recovery
and then reboot to recovery
5. Reboot to system
Install all further updates via OTA or via Updater app