Driver — Bt-bu1

The term is not a standard product name like "Realtek Audio" or "Intel Network Adapter." Instead, it refers to a Bluetooth USB adapter interface or a firmware loader for a Broadcom Bluetooth chipset (often the BCM20702 or BCM2070 series). The "BU1" designation typically points to a USB\VID_0A5C&PID_21E8 hardware ID.

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. bt-bu1 driver

A: Yes, but your Bluetooth will not work. If you don’t use Bluetooth, disabling is safe. The term is not a standard product name