StackRduino M0 PRO UF2 bootloader Adafruit UF2 bootloader for the StackRduino M0 PRO . Step 1 - Clone Repository and Set Up Environment git clone https://github.com/adafruit/uf2-samdx1 cd uf2-samdx1 Step 2 Install ARM-Cross Compilers sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa sudo apt-get update sudo apt-get install gcc-arm-embedded Step 3 Compile Board make BOARD=stackrduino_m0_pro Updating Firmware Option 1 Attach StackRduino M0 PRO to your computer via USB. Double Tap 'reset' button to put board into UF2 Bootloader mode Download the update-bootloader-M0-PRO uf2 file Copy update-bootloader-M0-PRO.uf2 to the USB Drive called "StackRduino" Done. Option 2 Attach StackRduino M0 PRO to your computer via USB. Download the update-bootloader-M0-PRO ino file Open the file using the Arduino ide and select the board and port for the StackRduino M0 pro. Upload the bootloader via normall upload icon Done.