Скачать или смотреть How To Install A Custom ROM on Xiaomi Mi 8 - MIUI 10, Xiaomi eu, MIUI 9.5 Global

So, Here is my quick guide on how to install a custom ROM on the Xiaomi Mi 8, although the basic steps will work on all Xiaomi phones. I'm going to be going through step by step on how to UNLOCK your BOOTLOADER, Install TWRP and finally install the Custom ROM of your choosing.

Disclaimer:
It will void your warranty. If you wish to install any type of custom ROM on your smartphone and if anything goes wrong, then the manufacturer is not responsible for it.
You may brick your phone or your phone may not power on thereafter.
The Xiaomi Mi 8 phone may become more sluggish and laggy if you install non-optimized custom ROM on the devices.

LINKS:

STEP 1: UNLOCKING BOOTLOADER:
Application: https://en.miui.com/unlock/
Download MiUnlock Tool: http://en.miui.com/unlock/download_en...

STEP 2: SETTING UP ADB & INSTALLING TWRP
ADB: https://www.xda-developers.com/instal...
TWRP: https://androidfilehost.com/?w=files&...
PLEASE USE THIS VERSION TWRP alt version: https://drive.google.com/file/d/1frvr...

STEP 3: CUSTOM ROMS:
Xiaomi.eu MIUI 10 Beta: https://xiaomi.eu/community/forums/mi...
Official MIUI 9.5 Gloabl: https://yadi.sk/d/uvCTaEl-3ZKhDz