If this device appears as "Unknown" in your Device Manager, follow these steps to resolve the issue:
On some systems, it functions as a Human Interface Device (HID) mini-driver that manages the "Airplane Mode" hotkey or switch. Acpi Fnbt0000 Driver
As part of the Advanced Configuration and Power Interface (ACPI) standard, it helps the operating system manage the hardware's power state. How to Install the Driver If this device appears as "Unknown" in your