If you're still having issues with your Ralink Rt3290 Bluetooth adapter on Windows 11, consider seeking help from:
If your Bluetooth has disappeared or shows a "yellow triangle" in Device Manager after upgrading to Windows 11, use the following guide to restore connectivity. Ralink Rt3290 Bluetooth Driver Windows 11
Some users report that the Windows 10 driver (signed for version 1809) works on Windows 11 version 22H2 and newer. If you're still having issues with your Ralink