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====== VIM3/3L Boot into Upgrade Mode ======

There are 4 ways to boot into upgrade mode:

  * TST Mode (Recommended)
  * Keys Mode (Side-Buttons)
  * Serial Mode
  * MRegister Mode

===== TST Mode =====

<WRAP tip >
TST Mode recommended as preferred upgrade mode
</WRAP>

  - Connect VIM3 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 (Blue) blink for about 3 seconds.
  - After the Power LED (Red) turns OFF, this indicates that the board is in Upgrade Mode (Maskrom Mode).

===== Key Mode =====


  - Power on VIM3.
  - 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. You will see the sys-led turn ON when you’ve entered Upgrade Mode.

===== Serial Mode =====

  - Connect VIM3 to PC with a USB-C cable.
  - Refer to [[products:sbc:vim3:development:setup-serial-tool|Setup Serial Tool]] to setup your Serial Tool for VIM3.
  - 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 VIM3 boot into U-Boot command line.
  - Type ''run update'' in the terminal of U-Boot. The Sys LED (White) will turn ON when you’ve entered Upgrade Mode.

===== MRegister Mode =====

  - Power on VIM3.
  - Use a tweezer to short-circuit the two pads of the M register, and without releasing…
  - Short press the Reset key and then release it, to boot into upgroup mode
===== Bootable TF Card =====

  - [[products:sbc:vim3: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 VIM3.
  - Connect VIM3 to PC with a USB-C cable.
  - Hit ''SPACE'' key at the moment of bootup to stop autoboot. This step will let VIM3 boot into U-Boot.
  - Type ''run update'' in the U-Boot terminal.