If the board supports it, the USB port can now be explicitly specified, eg: pyb.usb_mode('VCP', port=0). port=0 is USB FS and port=1 is USB HS.
If the board supports it, the USB port can now be explicitly specified, eg: pyb.usb_mode('VCP', port=0). port=0 is USB FS and port=1 is USB HS.