or choose a file:
Prefer PJRC's official Teensy Loader app instead of this page? Browse the FIRMWARE folder to download a .hex file manually.
First, put the device into update mode:
1. Unplug all cables (including DC power)
2. Remove the top cover (or reach under with a flat tool)
3. Hold the button on the green board
4. Plug in the USB cable
5. Release the button
Click the button above once the device is in update mode, then choose it from the popup. The update starts automatically.