Please try the following:
- Use the original cable supplied with the device.
- If you are using a USB hub, connect the device directly to a USB port on your computer without using a hub.
- Restart your computer.
- Connect the device to another USB port on your computer.
- Connect the device to another computer.
Note: If you are using the Smart Meeting PSE0501, make sure that you have connected the USB cable to the USB/output.