Hi @Kessie

It certainly is possible to get Mission Planner working because that's what I was using when we demonstrated it at the recent AP conference in Kaga Japan
https://www.youtube.com/watch?v=tsLEcEUyBYs

My random guess is that ArduPilot is not actually starting successfully.

We have some light instructions here on the ArduPilot wiki although they mostly link back to the ModalAI site.

I have a starling2 max so I'll pull it out and try and help investigate