Ralink: Rt3090bc4 V20a Driver

Keep using it if:

Replace it if:

Here is the critical point: There is no driver specifically named "rt3090bc4 v20a." The V20A is a board-level marking, not a chipset variant. The operating system only needs the generic RT3090 driver. ralink rt3090bc4 v20a driver

This is a PCIe 802.11b/g/n single-chip WiFi controller. Ralink (now MediaTek) released it years ago, so official driver support dried up after kernel 4.x.

  • Right-click > Update driver > Browse my computer for drivers.
  • Click Let me pick from a list of available drivers on my computer.
  • Click Have Disk > Browse.
  • Navigate to the extracted folder, then go to the Win7 or Win8 subfolder, and select the .inf file (e.g., netr28x.inf).
  • Ignore the “driver not signed” warning (on Win10/11, you may need to disable Driver Signature Enforcement temporarily).
  • Install the driver. Reboot.

    • In the world of wireless networking, few chipsets have demonstrated the longevity and resilience of Ralink’s 300Mbps series. The Ralink RT3090BC4 V20A is a specific variant of the RT3090 chipset – a single-chip, 2x2 MIMO (Multiple-Input Multiple-Output) 802.11n PCI Express Mini Card solution. While the name might look like a string of cryptic code, for many laptop and embedded system users, this component is the bridge to wireless connectivity. Keep using it if:

    The “V20A” designation typically refers to a specific board version or reference design used by OEMs (Original Equipment Manufacturers) like AzureWave, Lite-On, or ASUS. You will often find this card in older notebooks (circa 2010-2015), industrial embedded PCs, and POS systems. However, the biggest challenge users face is finding and installing the correct ralink rt3090bc4 v20a driver for modern operating systems like Windows 10, Windows 11, or various Linux distributions.

    This article provides a 360-degree view of this driver—covering manual installation, legacy OS support, troubleshooting common errors, and alternatives when official support ends. Replace it if: Here is the critical point:

    Modern distros (Ubuntu 22.04+, Fedora 35+, Arch) either:

    | Feature | Specification | | :--- | :--- | | Chipset | Ralink RT3090 (MediaTek MT7590 equivalent) | | Host Interface | PCI Express (PCIe) mini card | | Wi-Fi Standard | IEEE 802.11b/g/n (Wi-Fi 4) | | Frequency Band | 2.4 GHz only | | Maximum Data Rate | 150 Mbps (theoretical) | | Antenna Configuration | 1x1 SISO (Single Input, Single Output) | | Security | WEP, WPA, WPA2, 802.1x | | Operating Systems | Windows XP, Vista, 7, 8, 8.1, 10 (legacy driver required), Linux (kernel native), very limited compatibility with Windows 11 |

    Cause: The RT3090 struggles with 802.11n mixed mode on modern routers.

    Fix:

  • On your router, create a separate 2.4GHz SSID with WPA2-PSK (not WPA3) and channel width fixed to 20MHz.