The appearance of an unknown ACPI\FNBT0000 device is almost always a . There are three primary reasons why this happens:
There are several approaches to solving this problem, ranging from simple to more involved. We will focus on the first.
The original OEM driver may be outdated or incompatible with the current Windows build. Solutions for ACPI\FNBT0000\0 Driver Windows 10 Try these solutions in order. Solution 1: Update Drivers via Device Manager (Automatic) acpi fnbt0000 0 driver windows 10
The specific string points directly to a specialized function layer:
If you're experiencing issues with the ACPI FNBT0000 0 driver on Windows 10, try the following troubleshooting steps: The appearance of an unknown ACPI\FNBT0000 device is
If you’ve recently opened on a Windows 10 laptop (especially an older ASUS, Lenovo, or Acer model), clicked View > Show Hidden Devices , and expanded the System devices tree, you might have seen it: FNBT0000 .
Look for a link that says right below the main check button. If you do not see this link, Windows Update does not currently have any optional drivers for your machine. Expand the Driver updates section. The original OEM driver may be outdated or
Last updated: 2025. Applicable to Windows 10 versions 1809 through 22H2.
You can resolve this "Unknown Device" in Device Manager by downloading the official driver from Fujitsu: Visit the Fujitsu Support Downloads page.
You can often find this driver by searching for "Airplane Mode HID Mini-driver" or "Virtual Keyboard Device" on your laptop manufacturer's official support site.