Sacado del foro de MIUI:
http://en.miui.com/thread-1654667-1-1.html
MIUI 9 Global Beta ROM 8.2.1 Full Changelog
Game speed booster
New - A column for online games (01-30)
Notification
Fix - [Oreo] The contents of the Notification bar are covered by the black area (01-30)
Fix - [Oreo] The notification bar shows white after updating to 8.1.18 (01-30)
Home screen
Fix - Home screen is displayed incorrectly when the language is set to Arabic (01-30)
Wallpaper
Fix - Cannot enter settings of wallpaper carousel page (01-30)
Lock screen (Mi 6)
Fix - Double tap to wake not working (01-30)
Settings
Fix - Tapping on 'i' icon in app permission page lands back on app info page (01-30)
Downloads:
Redmi Note 4 MTK
http://bigota.d.miui.com/8.2.1/miui_...0159cd_6.0.zip
Redmi Note 4 QUALCOMM (SNAPDRAGON)
http://bigota.d.miui.com/8.2.1/miui_...810f8d_7.0.zip