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Boot into Upgrade Mode

In order to flash the OS into eMMC with USB Upgrade Tool, you need to put the board enter Upgrade Mode.

There are 4 ways to boot into upgrade mode:

Connect VIM4 to PC with a USB-C cable.
Quickly press the Function key 3 times in 2 seconds, then release the key. You will see the Power LED (Red) blink for about 3 seconds.
After the Power LED (Red) turns OFF, this indicates that the board is in Upgrade Mode (Maskrom Mode).

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