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Maskrom Mode

The OTG interface of ROCK 3B is located on the upper USB 3.0 interface. If you need to enter Maskrom mode, you should first adjust the switch under the USB 3.0 socket to the device side. In Maskrom mode, you can connect the host via a USB-A to USB-A cable and use the rkdevtool or upgrade-tool to perform operations such as erasing and USB flashing your product.

How to Enter Maskrom Mode​

Follow these steps to enter Maskrom mode:

  1. Turn the switch under the USB 3.0 socket to the device side

device

  1. Use a USB-A to USB-A cable to connect to the PC host from the OTG port
  2. Short-circuit the Maskrom pin, which is located between the USB 3.0 socket and Ethernet, as shown in the attached picture

Maskrom

  1. Plug in the power cord and power up. If the green light on the power supply is always on, you have successfully entered Maskrom mode.
  2. Insert the eMMC or microSD card that needs to be operated
  3. Use rkdevtool or upgrade-tool for Maskrom mode operation