Usb Vid-0fe6 Amp-pid-9900 Best

The identifier VID 0FE6 & PID 9900 refers to the Corechip SR9900 USB 2.0 to Fast Ethernet Adapter

How to Find the Right Driver (Safely)

Since the official IC Plus website is defunct for consumer drivers (the company pivoted to optical sensors and automotive ICs), here is the safe harbor method:

• Cause: The EEPROM on the adapter is blank or corrupted. The chip defaults to a software-generated MAC.
• Fix: This can only be fixed by flashing the EEPROM using a dedicated tool from IC Plus. For most users, return the adapter. It will cause DHCP pool exhaustion on corporate networks.

• The kernel module is ax88772 (again, due to ASIX compatibility).
• If the device is not recognized automatically: sudo modprobe ax88772
• To make it permanent: echo "ax88772" | sudo tee -a /etc/modules
• In dmesg, you should see: usb 2-1: Product: USB 2.0 10/100M Ethernet Adaptor and asix 2-1:1.0 (unnamed net_device) (unregistered): eth1: register 'asix' at usb-...

In Linux, this chip typically uses the cdc_ether or sr9700 kernel module.

Windows: Usually plug-and-play in Windows 10/11. For older versions, it often requires the Corechip SR9900 driver.

• Check lsusb -v (Linux) or the USB Details in macOS/System Report to view bDeviceClass, bDeviceSubClass, and interface descriptors. These fields indicate whether the device is a CDC (serial), HID (input), Mass Storage, Audio, etc.