Uarm swift pro recognised but not responding

My uarm swift pro is connected but not responding. I can see it is registrering commands but it does not respond to any input given. I am working on a Mac, High Sierra. Same goes for the app on my mobile device, it is connecting but not responding to commands. I try to downgrade the firmware which is not accepted when I start uarm studio, it forces me to upgrade to the latest firmware. I try to remove UArm studio completely and then reinstalling it without succes. Tried another USB cable also without luck. Anybody got some idea’s?

You could use Arduino IDE to send Gcode to control it, to check whether the uArm is working.