The generic Windows 8.1 driver does not fully support BLE in Windows 11. Solution: You need the CSR Harmony BLE driver . Look for version 1.5.0.0 or higher. This adds proper support for Bluetooth heart rate monitors, smart locks, and IoT sensors.
If you continue to face issues after following this guide, consider retiring the 75270-based adapter. Modern Bluetooth 5.3 USB dongles cost less than $15 and offer better range, speed, and native Windows 11 support. However, for basic keyboard/mouse setups or legacy file transfers, the trusty 75270 driver remains a reliable workhorse. 75270 bluetooth driver
To successfully install a 75270-listed device, users should follow a tiered approach: Native Driver Refresh: The generic Windows 8