Hello all, my electronic box build is based on AR4, but the robot is AR3. Therefore i use the AR4_teensy41_CUI skatch. situation: i can connect from Arduino (both (Arduino + Teensy) SW-packags installed) to Teensy to upload sketch: but when i open the python AR4 Software and set the com to: 4 (and click on the button: "Set Com Teensy") it still shows the error message: "unable to establish communications with Teensy 4.1 controller: any suggestions how to debug/check the connection? br Martin