Today Xiaomi has finally released the complete ROM about Xiaomi MI6. Previously Xiaomi MI6 OS update was released before, but you can only update by OTA, no card flash ROM to download and update. Right now MIUI official has released the stable version and developer version of complete ROM, due to stable issue by card flash, so they don’t release it temporarily.
The developer version is MIUI 8.5.11, but the stable version is MIUI V8.2.17.0. According to users’ feedback, both versions can fix the restarting issue, WIFI issue, etc. In addition, Xiaomi MI6 comes with Bootloader lock, so you need to unlock first and then flash it by USB Cable, click here to apply.
Download Flash ROM here:
http://www.miui.com/shuaji-393.html
How to Install the ROM:
http://www.miui.com/shuaji-393.html
How to Unlock the phone?
http://www.miui.com/thread-3367802-1-1.html