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====== 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.\\

<wrap info> There are 4 ways to boot into upgrade mode:</wrap>

  * TST Mode (Recommended)
  * Key Mode
  * Serial Mode
  * Bootable TF Card

<tabbox TST Mode (Recommended)>
  - 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.
  - The Power LED (Red) turns OFF, which indicates that the board is in Upgrade Mode (Maskrom Mode).
<tabbox Key Mode>
  - Connect VIM4 to PC with a USB-C cable.
  - Long press the ''POWER'' key without releasing it.
  - Short press the ''RESET'' key and release it.
  - 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.
<tabbox Serial Mode>
  - Connect VIM4 to PC with a USB-C cable.
  - Refer to [[products:sbc:vim4:development:setup-serial-tool|Setup Serial Tool]] to setup your Serial Tool for VIM4.
  - Once again, make sure you’ve done the correct connections and setup.
  - Hit ''SPACE'' on your keyboard at the moment of bootup to stop autoboot. This step will let VIM4 boot into U-Boot command line.
  - Type ''run update'' in the terminal of U-Boot then the board will enter Upgrade Mode.
<tabbox Bootable TF Card>
  - [[products:sbc:vim4:development:create-bootable-tf-card|Create a Bootable TF Card]].
  - Insert a Bootable TF card into the slot.
  - Refer to this guide to setup your serial tool for VIM4.
  - Connect VIM4 to PC with a USB-C cable.
  - Hit ''SPACE'' key at the moment of bootup to stop autoboot. This step will let VIM4 boot into U-Boot.
  - Type ''run update'' in the U-Boot terminal.
</tabbox>