I am seeing an issue with own design Ublox-Neo-M9N GPS board. I followed the steps mentioned here (PX4 DroneCAN Firmware | PX4 Guide (main)) and flashed the bootloader and then fw as mentioned successfully.
The Setup is: V5+ Autopilot, Jmavsim, QGC HITL mode enabled and working fine.
When I tried to enable UAVCAN_ENABLE to 2 in QGC, post reboot parameter always returned to Disable. I tried reporting reporting from nsh terminal, as I type command, it vanishes and returns nothing. Just to be sure I am using this setup in Mac M2. No LED glows, checked manually the voltage, all looks good. I tired one more thing, updated the UAVCAN_ENABLE default to 2 and rebuilt the pX4 firmware and updated Autopilot with that as well. the result is same. I seems to be missing, some basic step. I am using QGC version 4.4.2. Appreciate your inputs/help.