3. MaskRom mode

See startup mode for an introduction startup mode

MaskRom pattern is the last line of defense equipment burn out. Forced entry MaskRom involved hardware operation, have certain risk, so only in the equipment into the Loader mode, can try MaskRom mode.

Please read carefully and operate carefully!

The operation steps are as follows:

  1. Disconnect all power supplies.

  2. Hold down the Maskrom button

  3. Connect the equipment and host machine with Type-C data cable.

  4. Wait a moment, Loosen the Maskrom button


When the board has NOR flash at the same time, if EMMC is empty and there are burned files in NOR flash, it is necessary to short circuit the D0 and GND test points near NOR flash to enter Maskrom mode. And now we have to refer to the chapter “Switching Upgrade Storage” for upgrade


At this point, the device should go into MaskRom mode.