Beginners • Re: USB device IO error help please

The last line (IOError: pywws.device_cython_hidapi.USBDevice.read_data failed) seems to be the clue. The USB 'device' (which is kind of a software thing, more than a physical hardware thing) is not behaving as expected.

A couple of questions:

• is it plugged in?
• does it have power?

I know these are trivial questions, but they catch people out. People including me, I'm not ashamed to admit.

For a basic test if the device is found by your system:

1. unplug the USB cable
2. type lsusb in a terminal
3. plug the USB cable back in
4. type lsusb in the terminal again
5. see if there was any difference

Your device might have USB VID = 1941 and PID = 8021. If you see any new device appearing in the second lsusb call, that's hopeful.

Statistics: Posted by scruss — Sun Dec 21, 2025 4:10 pm

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