[Leo]

Now I installed Mobilesheets on my MacBook Air M2.
Loaded my backup from Dropbox w/o restoring settings.
CME Widi Master (firmware 2.2.1 once more installed via iOS app) is detected, paired and connected.

--> No data is transferred during changing to a no song
--> Editor windows (midi menu) shows received data

Edit:
Finally I connected the Stage 4 with the Roland AX with my two WIDI Master.
Both boards play the notes of the other. The adapters work perfect!

I'll give it up!