Search an online hardware database or search engine using that specific string to locate the exact manufacturer driver (such as Realtek, Broadcom, or CSR). Safety Warning Regarding Driver Downloads
Check for a driver if the specific "Uac Demo" one is missing. Fix Bluetooth disappeared in Windows - Microsoft Support Uac Demo V1.0 Bluetooth Driver
In Device Manager, click "Action" > "Scan for hardware changes". Search an online hardware database or search engine
A yellow warning triangle appears next to "UAC Demo V1.0" under the or Universal Serial Bus controllers section in Device Manager. Uac Demo V1.0 Bluetooth Driver