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Run the standard Lenovo installer with an extraction flag:
By understanding this small but critical piece of software, you save yourself from buying a new battery prematurely or living with broken function keys. Keep your drivers clean, keep Lenovo Vantage updated, and your ACPI FNBT0000 device will remain happily invisible in Device Manager—exactly where it belongs. Have a different error code on your FNBT0000 driver? Leave the exact code (e.g., Code 28, 10, 43) and your Lenovo model number in the comments below for targeted troubleshooting. Acpi Fnbt0000 Driver
The driver is actually a – it has no physical hardware. The INF file tells Windows to create a virtual device node at Root\ACPI_FNBT0000 . It then registers GUIDs for power management callbacks. Run the standard Lenovo installer with an extraction