https://wccftech.com/xiaomi-taking-beta-testers-mi-6-android-o-global-beta-rom-redmi-5anote-5a-miui-9-global-rom/

Earlier this month, Xiaomi started the development of Android 8.0 Oreo for its premium smartphones. The company rolled out Oreo-based MIUI 9 ROM to select Mi 6 users. At that time, the program was limited to the Mi 6 users on MIUI China Alpha ROM. But now Xiaomi seems to be extending the update to the Mi 6 users all over the world. The Oreo-based MIUI 9 ROM will soon be available for global Mi 6 users.

On its MIUI forum, Xiaomi announced that it is currently taking tester for a closed Oreo beta for the Mi 6 smartphone users. The program is open to Mi 6 users in all the regions, but Xiaomi makes it clear that the device must be running the latest version of MIUI Global Developer ROM.