Make sure that 'Midimon' is selected as the board (see below section), then restart Midimon into the bootloader mode by holding down the OK button while powering it up. Then do Sketch->Upload. During firmware flashing, the Blokas logo should play scrolling animation. Once the firmware is flashed, you'll have to restart the device manually by switching it off and on again.
Go to your Arduino Sketchbook location (you can find the full path to it in the Arduino IDE's Preferences dialog), create a 'hardware' folder if there isn't one yet, and clone Blokas-Boards repo inside it:
cd .../arduino/
mkdir -p hardware
cd hardware
git clone https://github.com/BlokasLabs/Blokas-BoardsThen restart the Arduino IDE.
After this, 'Midimon' should appear in the Arduino IDE's Tools->Board menu.
- https://github.com/BlokasLabs/Midiboy - Midiboy Core library.
- https://github.com/BlokasLabs/Blokas-Boards - The board definition repository.
- https://github.com/BlokasLabs/Midimon-Bootloader - The bootloader.
- https://github.com/BlokasLabs/USBMIDI - USBMIDI library.