In rare cases on older Windows versions (7/8), plugging in the device triggers a DRIVER_IRQL_NOT_LESS_OR_EQUAL or SYSTEM_THREAD_EXCEPTION_NOT_HANDLED crash.
0FE6:9900 dongles are notoriously fragile. Symptoms of hardware death include: usb vid-0fe6 amp-pid-9900
Today, it is a troubleshooting relic. If you have one in a drawer, it might save you during a Linux install or retro computing project. But for everyday use, consider recycling it and buying a modern USB 3.0 Gigabit Ethernet adapter (Realtek RTL8153 or ASIX AX88179) for under $15. In rare cases on older Windows versions (7/8),