VIM4 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:

TST Mode (Recommended)

  1. Connect VIM4 to PC with a USB-C cable.
  2. 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.
  3. The Power LED (Red) turns OFF, which indicates that the board is in Upgrade Mode (Maskrom Mode).

Key Mode

  1. Connect VIM4 to PC with a USB-C cable.
  2. Long press the POWER key without releasing it.
  3. Short press the RESET key and release it.
  4. Count for 2 to 3 seconds, then release the POWER key to enter into Upgrade Mode. The Sys LED (White) will turn on when you’ve entered Upgrade Mode.

Serial Mode

  1. Connect VIM4 to PC with a USB-C cable.
  2. Refer to Setup Serial Tool to setup your Serial Tool for VIM4.
  3. Once again, make sure you’ve done the correct connections and setup.
  4. Hit SPACE on your keyboard at the moment of bootup to stop autoboot. This step will let VIM4 boot into U-Boot command line.
  5. Type run update in the terminal of U-Boot then the board will enter Upgrade Mode.

Bootable TF Card

  1. Create a Bootable TF Card.
  2. Insert a Bootable TF card into the slot.
  3. Refer to this guide to setup your serial tool for VIM4.
  4. Connect VIM4 to PC with a USB-C cable.
  5. Hit SPACE key at the moment of bootup to stop autoboot. This step will let VIM4 boot into U-Boot.
  6. Type run update in the U-Boot terminal.