Bt-bu1 Driver [patched] -

A: The chip may be physically damaged. Try a live Linux USB – if Linux detects the chip, Windows driver is the issue. If not, the hardware has failed.

A: No. The BT-BU1 is specifically for Bluetooth 4.0 CSR chips. Bluetooth 5.0 dongles require Realtek or Intel drivers. bt-bu1 driver