Despite correct driver installation, the RT3090BC4 V20A can exhibit strange behaviors. Here’s how to fix them.
Warning: Many driver download websites bundle malware, adware, or fake “driver updater” tools. Avoid sites like driver-driver.com, mydriverdownload.net, or any popup-heavy portals. ralink rt3090bc4 v20a driver
sudo apt update
sudo apt install firmware-ralink
sudo modprobe rt2800pci
The "RT3090" is the key. This is a single-chip 802.11n (Wi-Fi 4) solution from Ralink Technology (now MediaTek). Key specs: Despite correct driver installation, the RT3090BC4 V20A can
lspci -nn | grep Ralink
Output example: 03:00.0 Network controller [0280]: Ralink corp. RT3090 Wireless 802.11n 1T/1R PCIe [1814:3090] The "RT3090" is the key
Even with the correct driver, issues can arise. Here is a symptom-based guide.
| Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| Code 10: This device cannot start | Driver conflict or resource conflict in Windows 10/11. | Uninstall the device, scan for hardware changes, then reinstall using the "Add legacy hardware" method. |
| Code 31: This device is not working properly | Corrupted driver storage. | Run sfc /scannow in CMD as admin. Then use pnputil /delete-driver to remove old driver remnants. |
| Wi-Fi connects, then disconnects | Power management is turning off the card. | Go to Device Manager > Network Adapters > RT3090 Properties > Power Management tab. Uncheck "Allow the computer to turn off this device." |
| Limited connectivity (no IP address) | The driver is not handling DHCP well. | Set a static IP or update to a newer driver version (5.1.24.0 has better DHCP handling). |
| Card works in Linux but not Windows | Windows driver signature enforcement or NDIS version mismatch. | Use Linux as your OS for this hardware, or dual-boot. The hardware is physically fine. |
| Card not detected at all in BIOS/Device Manager | Hardware failure or loose connection. | Reseat the mini-PCIe card. Check for bent pins or burned components. On a laptop, it may be dead. |
The RT3090 series was discontinued years ago. MediaTek (the successor company) does not release new drivers for it. Microsoft’s modern driver models (NDIS 6.4 and above) have gradually deprecated support for older drivers. This means that while the hardware is physically capable, the software bridge between the OS and the card is outdated.