I still haven’t got a response from oscdump. my also runs but just sits there. I noticed during the trouble shoot you’ve linked I got some errors that stood out?
ftdi_sio ttyUSB0: usb_serial_generic_read_bulk_callback - rub stopped: -32
ftdi_sio ttyUSB0: error from flowcontrol urb
I don’t know what they mean but perhaps they have something to do with oscdump not running?