Right-click your Corechip Ethernet adapter and select . Navigate to the Power Management tab.
Open , right-click the problematic device, and choose Update driver . Select Browse my computer for drivers .
Windows 10 and 11 are very good at automatically finding and installing drivers for common devices. usb vid-0fe6 amp-pid-9900
If your internet drops randomly while using the adapter, Windows' power-saving feature is likely aggressively putting the USB port to sleep.
Every USB device broadcasts a unique alphanumeric identifier to the host operating system upon connection. This allows the system to pair the hardware with its correct software driver. Right-click your Corechip Ethernet adapter and select
If it shows as an "Unknown Device" or a "CD-ROM Drive," you can download the 2.0.5.0 driver from hardware archive sites like DriverMax or DriverIdentifier .
The VID 0FE6 belongs to , but in the wild, this ID is often used by generic manufacturers producing clone chips. The device PID 9900 identifies it as a USB 2.0 Fast Ethernet adapter. Select Browse my computer for drivers
Because these are often mass-produced "clones," the drivers are rarely signed by a major vendor. If you plug this into a modern Windows 10 or Windows 11 machine, it often fails to install automatically. You are usually forced to hunt down the dm9601.sys driver or use a driver pack utility.
If you encounter issues, try these steps in order: