The most common solution for this specific ID is the driver. This is a foundational utility that allows Windows to "talk" to the function buttons. Visit the official Fujitsu Support Portal . Enter your device Serial Number . Search for Fujitsu BIOS Driver or FUJ02E3 . Download the version compatible with Windows 10/11. Run the installer and Restart your computer. 🔌 Step 3: Install Fujitsu Function Manager
After installing these packages, return to Device Manager and check if the yellow mark on ACPI FnBT0000 has disappeared. acpi fnbt0000 driver fix