Step 1 - Plug in your device

Use a USB-C cable to plug your device into your computer. The TRMNL branded cable works great if you bought one.

Step 2 - Enter 'Flashing mode'

1. Turn off the device by flipping the power switch to 'OFF'
2. While pressing down on the circular button, flip the power switch to 'ON'
3. Let go of the circular button

Step 3 - Select your device

And the firmware version you want to install

Step 4 - Flash firmware

1. Click the 'Connect' button below
2. Select 'USB JTAG/serial...' from the list
3. Select 'Install' from the popup menu
4. Wait for the device to install the firmware (this may take a minute or two)
5. You should see a confirmation message within the popup menu

Step 5 - Restart your device

1. Turn the device off by flipping the power switch to 'OFF'
2. Wait approximately 15 seconds
3. Flip the power switch to 'ON'

Troubleshooting

If you get an error "Failed to execute 'open' on 'SerialPort' during Step 4:

• your USB-C cable might only be capable of charging (not data transfer)
• your device may not yet be in "flashing mode."

Repeat Step 2 or see this guide for additional options.