Mooink Nana bricked – How to enter MaskRom?

My Mooink Nana is bricked (stuck on boot logo). Need to flash firmware but can't get it into MaskRom mode.

Anyone know:

1. ⁠Correct key combo for MaskRom?

2. ⁠Which driver is needed for PC to detect it?

3. ⁠Where to find recovery firmware?

Thanks~