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  1. Connect the host machine USB port type-A with Debug UART connector (CN 27) on the board over USB-to-TTL Serial cable.

  2. Open in the terminal your preferred serial port communication program (minicom or gtkterm, for example) and configure the serial port

    Code Block
    port:         dev/ttyUSB0
baud rate:    115200
data bits:    8
stop bit:     1
parity:       none
flow control: none

  3. Power on the board and stop boot process within boot delay (5 seconds), using combination of the keys Ctrl+C.

  4. in U-Boot shell write command:

    Code Block
    > mmc erase 0x4000 0x20000x4000

    This command will erase u-boot from eMMC. The board will enter into Rockusb mode on the next power on.

  5. Connect USB Recovery Cable (CV-1361) to the CN7 connector on SBC-3.5-PX30, and the Host PC on the other end.

  6. Power on the board and repeat the instructions in the previous section to flash the bootloader and image.