Xiaomi has announced that the latest version of its operating system, MIUI 8, will be rolling out as a Global Stable ROM update to eligible devices starting Tuesday.

How to Upgrade
1) You can update via OTA if you are using MIUI V5 / MIUI 6 / MIUI 7 stable ROM. Go to 'Updater' on your phone and check for updates.
2) Please do backup important data before flashing. If you flash from Developer ROM to Stable ROM, please wipe all data, otherwise, it might cause serious incompatible issues like FC, no network etc.
3) Check flashing tutorials here: http://en.miui.com/a-232.html

Supported Devices
Devices getting MIUI 8 China Stable build on August 23rd are:
Xiaomi Mi5, Xiaomi Mi5 Pro, Xiaomi Mi Max (32 GB), Mi 4S, Mi Note, Mi 3/ Mi 4, Mi 2/2S, Redmi 2A, Redmi Note 3G, Redmi Note 2, Redmi Note 3( MTK)

Devices getting MIUI 8 China Stable build later (around August 29th) are:
Mi Max Pro( 64/128 GB), Mi Note Pro, Mi 4c, Redmi Pro, Redmi 3S/3X, Redmi 3，Redmi 2 Prime, Redmi 2, Redmi Note 3 Pro(Qualcomm), Redmi Note 4G (Single SIM), Redmi Note 4G( Dual SIM), Redmi 1S

MIUI 8 China Stable ROM Full Changelog:
Create scrolling screenshots - an amazing way to share information
Calculate and convert almost anything with the redesigned Calculator.
Discover the world around you with all-new and smarter Scanner
Quick ball - the ultimate one-handed control tool
Discover the beauty of reading with Mi Lanting system font
Transcribe your recordings seamlessly in the Recorder
Personalize your notes with beautiful templates
Get your photos sorted for you with all-new Gallery
Editing text becomes even easier with the new smart menu
Get stunning images delivered directly to your Lock screen with Wallpaper Carousel
Custom-made Xiaomi keyboard
Identify fraudulent SMS and secure your payments with improved security tools
All-new Battery saver