Restore H2 BIOS firmware with USB programmer module(CH341A)

Pin mapping of ROM
CS 1 8 3.3V
SO 2 7 3.3V
3.3V 3 6 CLK
GND 4 5 SI

Keep holding the clip to connect the pins.
While flashing, you have to keep holding the clip for 4~5 minutes.

You can refer to the user's tips(@rikkirich).