According to Xiaomi MIUI forum, MIUI 9 Third batch developer beta test starts now, they will start to test from August.28, those who have beta test access can click ‘Settings’→My device→MIUI version ‘OTA upgrade’. Considering different experience effect from different devices with various performance, some models may have adjustment about MIUI 9 functions.
Split screen function:
The split screen only supports MIUI OS based on Android N, namely, Android 7.x version, other models can click to check split screen introduction and supported models instruction.
Transmission door and information helper
Some models are under optimization, so after upgrading MIUI 9 OS will not enjoy this two functions first. Their engineer are trying to let users enjoy them. Just wait with patience.
Some models are under optimization, so upgrading to MIUI 9 OS may not enjoy this function at the first time.
The third batch to support upgrading to MIUI 9 OS.
Xiaomi MI Note, Xiaomi MI4, Xiaomi MI3, Xiaomi MI3 TD version, MI2/2S, MI Pad 3, MI Pad 2, MI PAD 1, Redmi Pro, Redmi Note 4x-MTK, Redmi Note 4, Redmi 4A, Redmi 4 Advanced, Redmi 4 standard, Redmi 3S/3X, Redmi Note 3 netcom, Redmi note 3 TDD/FDD, Redmi Note 2, Redmi note 4 dual SIM card, Redmi Note TD 4G/ FDD 4G, Redmi Note TD version, Redmi Note WCDMA, Redmi 3, Redmi 2A standard/advanced, Redmi 1S, Redmi 1S TD 4G, Redmi 1S TD Version, Redmi 1S TD 4G, Redmi 1s WCDMA 3GB/CDMA 3G, Redmi 1 TD-SCDMA, and Redmi 1 CDMA.
Open App in MIUI forum, enter into ‘Forum’→’MIUI 9 beta test’, and then fill in the information. When sign-up, choose your model and MIUI version: Developer version or Beta version.
After sign up, they will choose the tester according to forum points and activity to check, and then send you messages in the forum.
But one thing to be aware, the beta version is not so improved, there may be some risk, just backup your data first before upgrading. Stable version needs to unlock first and then use USB cable to flash the phone by beta test complete ROM. Check all news about MIUI 9 here.