Xiaomi released MIUI 9 Global Stable update for its Mi MIX 2 smartphone back in November, and announced Android Oreo beta program for the phone for China ROM last month, now it has released MIUI 9 Global Beta ROM 8.1.18 for the smartphone which is based on Android 8.0 (Oreo). Check out the changelog below, Android O (8.0) based MIUI ROM Gallery New - Optimize local storage to free up space (01-16) System Optimization - Animation for the Back gesture on full screen devices (01-17) Optimization - Full screen gestures as an alternative for screen buttons (01-17) Optimization - A separate guide for full screen gestures (01-18) Fix - Full screen gestures didn't work properly after rebooting (01-18) Battery Fix - The battery level is incorrect on status bar (01-16) Fix - Battery is draining very fast when the device is in idle mode (01-16) Camera Fix - The camera interface is not displayed correctly when the language is Arabic (01-16) Settings Fix - There are two Security in Accessibility settings (01-16) Line Fix - Line ANR when using Bluetooth headphone for Line calls (01-16) You can download the Recovery ROM here and flash it using updater method or download the Fastboot ROM to flash it using fastboot method. One the beta testing is complete Xiaomi is will roll out the stable update for all the users in the coming weeks. ... 
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