On August 11, Xiaomi Mi6, Xiaomi Redmi Note 4 and Xiaomi Redmi Note 4X will officially receive the update to MIUI 9 Global Beta. We are not talking about the China Developer ROM as happened with Xiaomi Mi5, but it is the global version dedicated to the international public. But, not everyone will be able to install this update: to receive it, you must be registered to the beta testing phase. Once you did (use the MIUI Forum to find all the information about how to do it), you will receive the OTA update to the new user interface with a simple notification to confirm in your status bar.
The number of version of MIUI 9 Global Beta for Xiaomi Mi6, Xiaomi Redmi Note 4 and Xiaomi Redmi Note 4 is 7.8.10. After Friday 11st August, there will be other devices to receive the update to the new firmware in its beta version. We are talking about Xiaomi Mi Note 2, Mi5, Mi 5s (because it received only the China Developer Beta), Mi 5s Plus, Mi 5s, Mi Max, Mi Max 2, Redmi 4, Redmi 4X. But we still do not know the exact date in which the update will arrive on these phones: rumors are suggesting August 25, but we are not sure about it.
After these updates there will be a third phase in which other Xiaomi phones will receive MIUI 9 Global Beta. They are Xiaomi Redmi 2, Redmi 2 Prime, Mi3, Mi5, Redmi Note 3 Qualcomm version, Redmi Note 3 Special Edition, Redmi Note 4 MediaTek version, Mi 4i, Redmi Note 2, Redmi Note Prime, Mi Max 32 GB version, Mi Max 64 GB and 128 GB version, Mi 2, Mi 2s, Redmi 3, Redmi 3 Prime, Redmi 3S, Redmi 3s Prime and Redmi 4A. After this phase we expect to see the final update to MIUI 9 for the Global Stable ROM, so all these phones will have it without registering to beta testing.