Mi 6 Will Update to Android Oreo Beta ROM
Xiaomi has launched the first Android Oreo Beta version of ROM for Mi 6. This is a Global Beta ROM 8.1.11 with installed Google services.
If you want to update your smartphone to the BETA Android Oreo version you should first update it to MIUI 9 Global Beta ROM. After the updating to the version v7.12.14 you will get the OTA notification that will update your device.
The ROM developers also recommend the users to make the backup of all the data of your device before you start the updating.