Impossible to connect my cube trought USB

Hi,
For four days I’m trying to connect my cube to mission planner with the USB cable.
Michael_Oborne try to help me but it is a mess.
when I install driver, the cube appear like a serial port named : “ProfiCNC CUBE F4-FMU”
but the COM is impossible to open with any serial communication software.
I’ve open a topic to ardupilot forum
https://discuss.ardupilot.org/t/impossible-to-connect-cube-to-mp-by-usb/50079

Please help.

Thanks