@Dagar you are right, i have selected the wrong firmware 1.5.5 on the container.
But if I select the correct one (1.5.5) I am not be able to calibrate all the sensors. So it is not possible to ARM the autopilot.
After I reinstall the 1.6.4.stable all sensors are possible to calibrate and there is no purple flash led after arming the autopilot. All outputs from the autopilot are as expected.
I have had a similar problem the the crossfire and the A2 from DJI. Regardless if I used S-Bus or PPM I got a failsafe after a few minutes. Must be something on the crossfire protocol. So for the A2/ DJI I use a Futaba RX or the Lightbridge and all working well.
Regarding the "logging" I have to read the manual first. At the moment no idea how to do it right.