(File > Export).
You open your Windows Device Manager, perhaps looking for a solution to a non-responsive keyboard backlight, a malfunctioning function key (Fn), or a Bluetooth failure. Under the "System Devices" or "Other Devices" tree, you spot a yellow warning triangle next to an entry labeled .
If you prefer not to install full manufacturer software suites, you can download the standalone driver package. Go to your laptop manufacturer's official support website. Search for your specific laptop model. Navigate to the section. acpi fnbt0000 driver fix
Alternatively, you might have encountered an error message stating: "This device is not working properly because Windows cannot load the drivers required for this device (Code 31)" or "The drivers for this device are not installed (Code 28)."
This makes the warning icon disappear, but your Fn key will never toggle Bluetooth again. You can still manage Bluetooth from Windows Settings or Action Center. (File > Export)
Perform a , but immediately after the first boot, install your laptop manufacturer’s chipset driver before connecting to the internet. This prevents Windows Update from overwriting your correct ACPI driver with a generic one.
Providing instructions on running the Windows System File Checker ( sfc /scannow ) to rule out OS corruption. If you prefer not to install full manufacturer
This usually appears after performing a clean install of Windows (7, 8, 10, or 11) or after a major Windows update.
Extract the downloaded .cab file using a utility like 7-Zip.
A: Yes. PNP0C31 is the generic ACPI hotkey device. Many manufacturers rename it to FnBT0000 . Fix is identical.