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Sometimes the driver is present but corrupted. Here’s how to refresh it:

If it fails, repeat the process but instead of restarting, use Method 2 above to manually install after uninstallation.


| Problem | Solution | |--------|----------| | Driver installs but Wi-Fi doesn’t work | Disable Driver Signature Enforcement (Shift + Restart → Troubleshoot → Startup Settings → Disable driver signature enforcement). | | Code 10 (Device cannot start) | Uninstall the device, restart, and reinstall using Method 2. | | Adapter disappears after sleep | In Power Options → Change plan settings → Change advanced power settings → Wireless Adapter Settings → Set to Maximum Performance. | | 64-bit driver not available | Use the Ralink RT5390 driver – it shares the same .inf and often works for wis09abgn. |

Prerequisites: You will need an alternative internet connection (Ethernet cable, USB tethering from a phone, or another PC to download the driver).

Step 1: Download the Correct Driver Navigate to a reliable driver repository (e.g., Station-Drivers or the official MediaTek legacy archive). Search for: "Ralink RT2870 USB driver Windows 10".

Step 2: Extract the Driver Files Do not run an installer if it doesn't exist. Most legacy Ralink drivers are distributed as a .zip or .7z archive containing .inf, .sys, and .cat files. Extract them to a folder on your Desktop (e.g., C:\Wis09abgn_Driver).

Step 3: Open Device Manager

Step 4: Manually Update the Driver

Step 5: Ignore the Security Warning Windows may warn that the driver is unsigned or from an unknown publisher. Because this is a legacy Ralink driver, click "Install this driver software anyway" .

Step 6: Reboot After installation completes, restart your computer. Your Wi-Fi adapter should now appear as "Ralink 802.11n Wireless LAN Card" or similar, and the yellow exclamation mark will disappear.


If drivers for Wis09abgn don't work, retrieve the actual hardware ID. This guarantees you get the right driver.

  • Copy that string (e.g., USB\VID_148F&PID_3070).
  • Paste it into Google or a driver database (like www.lcsc.com or driverpack.io). Download the driver specifically matched to that VID/PID.

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