User Manual

Entering Bootloader Mode

The first step to loading new code onto your board is triggering the bootloader. It is easily done by double tapping the

reset button. Once the bootloader is active you will see the small red LED fade in and out and a new drive will appear

on your computer with a name ending in BOOT. For example, feathers show up as FEATHERBOOT, while the new

CircuitPlayground shows up as CPLAYBOOT, Trinket M0 will show up as TRINKETBOOT, and Gemma M0 will show up

as GEMMABOOT

Furthermore, when the bootloader is active, it will change the color of one or more onboard neopixels to indicate the

connection status, red for disconnected and green for connected. If the board is plugged in but still showing that its

disconnected, try a different USB cable. Some cables only provide power with no communication.

For example, here is a Feather M0 Express running a colorful Neopixel swirl. When the reset button is double clicked

(about half second between each click) the NeoPixel will stay green to let you know the bootloader is active. When the

reset button is clicked once, the 'user program' (NeoPixel color swirl) restarts.