As of today there is a custom rom available for the MX4 Pro, created by Tatsuyuki Ishi.
All what you need is the TWRP recovery installed. For more details check the 2nd post!
What is working?
- Data & WiFi
- Audio over Bluetooth
- Home button (including mBack)
- Microphone (a bit buggy)
OmniROM for MX4 Pro 22.02.16