I am not sure what happened, but maybe someone can point me to the error I made:
After upgrading the firmware to 3.1.5 I went through the recalibration process, loaded the Iris with Front GoPro sessings and did the accelerometer calibration. The radio calibration worked fine.
I went to the flight mode settings and wanted to activate the super simple mode for test.
I am not sure whether it was related to this, but when I went back to the radio calibration tab all green bars are gone. The radio is totally unresponsive.
When restarting the Iris, the light blinks blue and stays in that node.
I cannot get the Iris armed, neither via Radio nor via Ground Station.
The telemetry receiver status light in the Iris is green. I did the repairing twice to ensure it is properly done.. to no avail.
Does anybody have an idea where I made a mistake or where I can start debugging?