Hi,
okay, after a (long, I'm not very good in such things) search, I realized that one Recom was very badly soldered.
After fixing that issue, I could upload the firmware and connect to QGC. Now, I can go ahead
However, I'm very disappointed that this happened with a new board. With 360€ (incl.DIMU) the AQ is not cheap. And I spent hours to get Pins and DIMU soldered, and the firmware flashed. It's really frustrating. I had problems with 2 of 3 AQs...
Jens