If you’ve recently updated Windows 10 and you’ve lost video from your 4K Pro Webcam or your webcam is no longer recognized by Windows, do the following:

1. Open Device Manager — go to the Start menu in Windows 10 and type “Device Manager” in the text box.
2. In Device Manager, check the Imaging Device section — if you see a yellow exclamation next to the device name or the device name shows UNKNOWN, then the drivers did not load properly.

To correct the issue:

1. In Device Manager, right-click on 4K Pro Webcam/UNKNOWN device with the yellow exclamation icon, and select Update Driver.
2. In the Update dialog, select Update Driver.
3. Select Let me pick from a list of available drivers on my computer.
4. Check Show compatible hardware (if not checked), then select USB Video Device (not Logitech 4K Pro Webcam), from the list.
5. Click Next.
   NOTE: If a list of categories is shown instead, select Imaging Devices, then USB Video Device.