If connectivity is unstable, open Command Prompt (Admin) and run netsh winsock reset followed by a reboot.
⚠️ Windows 11 does include native drivers for the 8811CU. You must install drivers manually. Generic Windows 10 drivers work correctly on Windows 11. If connectivity is unstable, open Command Prompt (Admin)
If Windows does not automatically recognize the device, follow these steps to install the driver manually: Generic Windows 10 drivers work correctly on Windows 11
Disable Windows Defender Real-time Protection temporarily (it may block unsigned INF files). Also, disconnect from the internet (unplug Ethernet) to prevent Windows Update from auto‑installing the wrong driver. The driver package for Windows 11 is version 1030
The driver package for Windows 11 is version 1030.44.1111.2021 or newer (e.g., 1030.45.x). Do not install versions 1026.x or 1030.27.x – they are for Windows 10 only.
The Realtek 8811CU Wireless LAN 802.11ac USB NIC Go to product viewer dialog for this item.
Microsoft tightened driver signature enforcement and removed legacy NDIS 5.x support in Windows 11. The older drivers that worked on Windows 7/8/10 (versions 1024.xx, 1030.xx) often trigger Code 52 (unsigned driver) or Code 31 (device not working). Additionally, Windows Update frequently offers a generic "Realtek 8821CU" driver instead—which is non‑functional for the 8811CU.