How to enter MarsBoard RK3066 recovery mode
From wiki
Recovery Mode on MarsBoard RK3066
Note: The recovery key is the VOL+ key.
Board not powered on
If the board is not powered on, to switch MarsBoard RK3066 to recovery mode, simply press and hold the RECOVERY key (VOL+) and connect the USB OTG cable to your PC. The board will turn on emitting a red light and will stay on recovery mode waiting for commands. If no recovery activity is found, the board will turn off after two minutes.
Board is powering on
When the board is power on, you can plug the OTG cable to your PC first and then one finger press and hold the RECOVERY key (VOL+), another finger press the PWR key. After 10 Second, the board will reboot and stay on recovery mode waiting for commands. If no recovery activity is found, the board will turn off after two minutes.
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