Xiaomi Mi 9

Xiaomi Mi 9

Although this device is A-only, you have to choose GSI for A/B devices because this device is "system-as-root".

Hardware Support

• Camera:

Basic usage works. Extented support (= access all cameras) still need work

• Speaker / Microphone

Works

• Bluetooth

A2DP AAC works

• Wi-Fi

Works, tethering works

• GPS

Works, including double band

• NFC

Works

• SIM / Mobile Data / Voice

Works, LTE+ works. Need to switch technology in *#*#4636#*#* to LTE/UMTS (global forces 3G... why?)

• VoLTE

Not tested

• Dual-Sim

Working except it's not possible to select main (4G) SIM

• Fingerprint Reader

Works but need high screen brightness

• Brightness control

Works

• Quick Charge

Works (9V/2A with USB PD charger)

• Wireless Charge

Works

• Type-c audio output

Works

• Video Playback

Lag on VP9 1080p 60fps VP9 4k 60fps has the issue AVC 4k 60fps https://github.com/phhusson/treble_experimentations/issues/458

Tested By:

• @phhusson - 17 March 2019
• @linjie997 - 03 April 2019
• @koenkk - 05 April 2019

Flashing instructions

No need for magisk, nor no-verity, no-forceencrypt...
You simply need to flash vbmeta then system.
Download vbmeta from https://github.com/TadiT7/xiaomi_cepheus_dump/raw/cepheus-user-9-PKQ1.181121.001-9.3.1-release-keys/firmware-update/vbmeta.img
Flash it with fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img
Flash system with fastboot flash system system.img
Reboot to recovery and factory reset.

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