802.11ac (Wi-Fi 5) backward compatible with 802.11a/b/g/n. Max Speed: Typically up to 433 Mbps on the 5GHz band.
Frequently identified in Device Manager as USB\VID_0BDA&PID_C811 .
Expand , right-click "Realtek 8811CU Wireless LAN 802.11ac USB NIC," and select Update driver . Choose Search automatically for drivers . Common Troubleshooting for Windows 11
Visit the official Realtek Download Center to find the latest "WLAN USB driver" package.
Download the .zip file, extract it, and run Setup.exe as an administrator. Restart your computer after the installation finishes. : Right-click the Start button and select Device Manager .