1. Download the Arduino `.ino` firmware file from:

 `/02_Arduino Program`

2. Download and install the Arduino IDE:

 https://www.arduino.cc/en/software/

3. Disconnect the 9V power and MIDI cables 4. Connect the FS-404 to your computer via USB

• Do not use a USB-C to USB-C cable
• If required, use two USB-C to USB-A cables connected together

5. If the board does not appear in the Arduino IDE:

• Open the Boards Manager
• Install the LGT8fx Boards add-on

6. Click Upload and confirm success in the output console 7. Disconnect and reconnect the pedal to reboot the firmware

In order to update the companion software, simply download and install the latest version here.