VID_0A5C = Broadcom. Search for that, and the bt-bu1 driver mystery is solved. Frequently Asked Questions (FAQ) Q: Is the bt-bu1 driver a virus? A: No. It is a legitimate Microsoft placeholder name for unrecognized Broadcom Bluetooth hardware.
A: Yes, but your Bluetooth will not work. If you don’t use Bluetooth, disabling is safe. bt-bu1 driver
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. VID_0A5C = Broadcom