As for introduction to boot mode, please refer to the chapter System booting.
MaskRom mode is the last line of defense against device bricking. Access to the
MaskRom mode by force involves hardware operations with certain risks. Therefore, the
MaskRom mode can only be tried if the device cannot enter the
Please read carefully and operate cautiously!
Steps are as below:
Cut off all power supply to the device.
Connect the USB Type-C cable to the
Type-Cinterface on the development board, keep
Type-Ainterface on the other end vacant.
Use metal tweezer to connect the two test points on the back of the board and keep them shorted, as shown below.
Type-Ainterface of the USB Type-C cable into the PC host.
Wait for a while and release the tweezer.
Then, the board should enter MaskRom mode and the PC host will find a Maskrom device.