Hello JColvin,
since morning, calibration works like a charm. No "Device is not communicating" anymore, although I believe I do everything the same way as before.
The bad calibration results were caused by my mistake. In the second step (connecting both probes to AWG1) I connected them to yellow (unconnected) cable on BNC adapter board.
I know it is hard to say, but I would be interested in Your oppinion on "Device is not communicating" behaviour.
Otherwise, it is done for me and I will hapilly keep unsing my Analog Discovery 2.
Thank You
Best Regards
Ondrej