MaskRom mode

See startup mode for an introduction startup mode

"MasRrom" mode is the last line of defense against device being
bricked. Forced entry "MaskRom" involved hardware operation, have
certain risk, so only in the situation that deivce failed entering the
"Loader" mode, you can try "MaskRom" mode.

Please read carefully and operate carefully!

The operation steps are as follows:

Disconnect all power supplies.

Connect the device and host PC with Type-C data cable.

Hold down the Maskrom button

Connect DC power

Wait a few seconds, release the button.


Where is the "Maskrom" button?Find in the

Interface Definition

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".