The string usb vid-0fe6 amp-pid-9900 is a prime example of a USB . This identifier is how your computer's operating system (like Windows or Linux) distinguishes one plugged-in device from another. Every USB device, from a mouse to a network adapter, must have a unique VID (Vendor ID) and PID (Product ID). You'll often see them in a format like USB\VID_xxxx&PID_yyyy in Windows Device Manager, or as ID xxxx:yyyy in a Linux terminal.
To get your device functioning, you can look for the official driver package ( Corechip SR9900 USB2.0 to Fast Ethernet Adapter ) through trusted driver archivers or laptop OEM support pages: usb vid-0fe6 amp-pid-9900
The driver is outdated and does not support newer operating systems like Windows 10 or Windows 11. The string usb vid-0fe6 amp-pid-9900 is a prime
The DM9601 chip relies heavily on stable 5V USB power supply. Disconnect the adapter from external unpowered USB hubs. You'll often see them in a format like