Custom ROM

• Sorry not yet
• It doesn't have any opensource code, so no one without reverse engineering can't create custom ROM.

GSI

There is list of GSIs that I have tried, but you can use any from this list

What works:

• Pen works perfect as on original OS, support pressure, tilt.

What not works:

• Fast charging (but I think it can be fixed if I fix it I will post tutorial here)

Installation:

• enable Developer options (click on About tabled -> Software version many times).
• Unlock USB debugging General Settings -> Developer options -> USB debugging.
• Connect to computer and allow connection.
• reboot to fastbootd

adb reboot fastboot

• flash your GSI ROM don't forget to change with your path to GSI image.

It will choose right slot and flash GSI ROM to it.

fastboot flash system gsi.img

• reboot to bootloader

fastboot reboot bootloader

• wipe userdata, cache and metadata

If not wiped, this can cause booting issues or other problems.

fastboot -w

• reboot to system

fastboot reboot

• Done your gsi is must boot and go and enjoy it.

Posible issues with GSI

I don't know why but fastboot can't found system_a so if current-slot:a it would not flash

To read current slot use this command

fastboot getvar all 

• solution is flash not to system but to system_b

To set current slot to b, do this

fastboot --set-active=b