步驟

0)

request unlock

https://en.miui.com/unlock/

1)

# download TWRP

https://dl.twrp.me/ferrari/twrp-3.0.2-0-ferrari.img.html

# supersu - Recovery Flashable.zip

http://www.supersu.com/download

2)

Install fastboot and adb drivers on PC

3)

adb devices

adb reboot bootloader

4)

fastboot boot twrp-3.0.2-0-ferrari.img
 

Install Lineageos

Required:

Twrp 3.2.x or newer, FW 8.1.5, Gapps 8.1 arm64 (pico recommended).

Install:

Boot recovery > Wipe Dalvik, Cache, System, Data > Install FW > Gappps > Su-Root (if needed) > Reboot