If any PCI device driver is missing on your Windows 11/10 computer, you can try any of the three methods in this post to download & install the driver.

However, user has to identify and know what’s the unknown device prior to installing correct driver. Here are some ways to find unknown device drivers in Windows.

Download the latest version of your Bluetooth device driver from the manufacturer’s website and install it manually without uninstalling the currently installed driver of your Bluetooth device.

Driver Magician can help you detect unknown devices in computers and give downloading link of correct device drivers. Database of unknown devices in Driver Magician contains more than 20,000 devices, ...

In the device manager, but in the first place which driver is required It is this free software "Unknown Device Identifier" that finds out what it is.