Revert to the default Windows drivers, then try UsbDk. It might not work for everyone but when it works properly, it's the best approach. Basically Dolphin takes control of the BT Adapter automatically when you boot a game with BT Passthrough enabled and automatically gives the control back to the MS BT Stack when done (e.g. when you close Dolphin)...
Avell A70 MOB: Core i7-11800H, GeForce RTX 3060, 16 GB DDR4-3200, Windows 11 (Insider Preview)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
ASRock Z97M OC Formula: Pentium G3258, GeForce GT 440, 16 GB DDR3-1600, Windows 10 (22H2)
