Microsoft (often distributed as a native Wi-Fi driver) or Ralink Technology Corp. Standard: IEEE 802.11n (Wi-Fi 4). Supported Radio Types: 802.11b, 802.11g, and 802.11n.

While newer versions like 5.1.25.0 exist, version 5.1.22.0 remains a "gold standard" for stability on legacy systems.

Typically supports speeds up to 150 Mbps or 300 Mbps depending on the specific hardware (1T1R or 2T2R configurations).

The is a specific software component primarily associated with Ralink (now MediaTek) chipsets, such as the RT5370 or MT7601 . This version is often used to ensure compatibility between older 802.11n (Wi-Fi 4) USB adapters and various Windows operating systems. Key Specifications of Version 5.1.22.0

Includes FIPS 140-2 mode and 802.11w Management Frame Protection. Compatibility and Supported OS

This driver version provides the necessary instructions for your operating system to communicate with the hardware's PHY and MAC layers. Roughly April 21, 2015.