Please remove sd card and emmc first, if you wanna boot rock3a to maskroom mode,
in v1.31 , you need to short these two pins ,
then plug the USB Male A to Mail A cable to ROCK 3A OTG port(the upper USB3 port), the other side to PC , and lastly power on the board
If you wanna boot rock3a to loader mode , you need to insert sd card or emmc, then the next step is the same as in maskroom mode
