Xiaomi Redmi 9C - phhusson/treble_experimentations GitHub Wiki

Xiaomi Redmi 9C (angelica)

Requirements

  • Stock Recovery
  • vbmeta.img
  • PC with ADB/fastboot drivers installed
  • Coffee :)

How to flash a GSI image?

Firstly, choose a GSI image you want to install according to the Android version and the architecture of our device. Redmi 9C uses a64 ab variant (arm32 binder 64 ab) so please make sure you picked the right one. After that, you should extract it to your desired location, then move it to the ADB location and rename the image file as 'system.img'.

Then plug it into your PC and then execute these codes in the command prompt.

fastboot devices
fastboot --disable-verification --disable-verity flash vbmeta vbmeta.img
fastboot reboot fastboot

Now, your Redmi 9C must boot in yellow fastboot mode (fastbootd). After that, do these steps onward.

fastboot getvar is-userspace
fastboot erase system
fastboot flash system system.img
fastboot reboot recovery

Voila! You have successfully managed to flash a GSI ROM to your Redmi 9C device! But wait, once it boots into stock recovery, don't forget to wipe or format the data after flashing the GSI image.

Working GSI builds

Hardware support

Component Comment
Camera √
Audio √/× (headphone jack doesn't work, but can be fixed with a simple code on termux)
Bluetooth √
Display √ (brightness slider doesn't work / can also be fixed via termux)
WiFi / Hotspot √
GPS √
SIM / Mobile Data / Voice × (RIL dead in GSI Phh of A11 and A12, only in GSI of Eremitein works)
VoLTE ? (Untested)
Fingerprint √
Offline Charging ×

Fixes

To fix the earphone issue, execute these lines on any Terminal Emulator (preferably Termux) then reboot.

su
setprop persist.sys.overlay.devinputjack true

For brightness, please also execute these lines on any Terminal Emulator.

setprop persist.sys.qcom-brightness $(cat /sys/class/leds/lcd-backlight/max_brightness)

Credits