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.
Introduction: What is the BT-BU1 Driver? In the world of PC hardware, few things are as frustrating as a mysterious device in the Device Manager sporting a yellow exclamation mark. For users who own specific motherboard chipsets—particularly older ASRock, Intel, or OEM systems—the label "BT-BU1 Driver" has been a source of confusion for years. bt-bu1 driver
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
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. In the world of PC hardware, few things
A: Windows 11 uses inbox Broadcom drivers. Just run Windows Update – the bt-bu1 driver will auto-resolve on most modern builds. Last updated: October 2025. For the latest driver versions, check your motherboard manufacturer’s support page under “Bluetooth” or “Wireless.”
A: Yes, but your Bluetooth will not work. If you don’t use Bluetooth, disabling is safe.
If you’re still stuck after following this guide, check your motherboard’s support forum or consider replacing the USB Bluetooth dongle – a $10 adapter might be a practical solution if the onboard chip has failed.