The WinUSB Test Device 1 is a device that typically appears in the Device Manager in Windows when a USB device is connected to the computer, but Windows does not recognize it or the proper driver is not installed. This device is often associated with the WinUSB (Windows USB) driver, which is a generic driver used for USB devices that don't have a manufacturer-specific driver. The Test Device designation indicates that the device might be in a testing or development state, often used in scenarios involving device development or debugging.

This issue usually arises if you're trying to connect a custom or development device, a USB device that doesn't have an official driver, or if there is an issue with the USB device or its connection.