There are 4 different ways to boot into Upgrade Mode:
- Keys Mode (Side-Buttons)
- Serial Mode
- TST Mode (Recommended)
- MRegister Mode
Usually, the first two methods will meet the needs of most users. However, in some cases such as burning an incorrect u-boot, or if your device is unable to boot at all, you can attempt to rectify the issue with the MRegister mode.
- Connect VIM1 to PC via USB-C cable.
- Long press the
Power
key without releasing it. - Short press the
Reset
key and release it. - Count to 10 seconds and release the
Power
key to enter into upgrade mode.
- Refer to this guide to setup your serial tool.
- Once again, ensure that you’ve done the right connections and setup.
- Hit any keys at the moment of bootup to stop autoboot. This step will let the board boot into u-boot mode.
- Type
run update
on the terminal of u-boot as below:
1 | kvim# run update |
- Connect VIM1 to PC via USB-C cable.
- Quickly press the
Func
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 (Blue) turns OFF, this indicates that the board is in Upgrade Mode (Maskrom Mode).
TST mode only available for VIM1 V14 or later.
- Connect VIM1 to PC via USB-C cable.
- Use a tweezer to short-circuit the two pads of the
M
register, and without releasing it. - Short press the
Reset
key and release it to boot into upgrade mode.
TipsThe
M
register is located on the backside of your board.