Troubleshooting
PX4 LED Meanings If you see a red LED there is an error and you should check the following:
Make sure the flight controller has an SD card installed. Make sure the YARI GNSS has yari_can-gps_canbootloader installed prior to flashing yari_can-gps_default. Remove binaries from the root and ufw directories of the SD card and try to build and flash again.