.FL1 File Extension
What is an FL1 file?
An FL1 file is a compressed BIOS update file used by Lenovo computers, such as ThinkPad and Yoga, running Windows. It contains a BIOS update that is "flashed" onto a computer.
BIOS stands for "Basic Input/Output System" and is a type of firmware used by a computer's microprocessor to boot the computer system when it is turned on. BIOS can also be used to manage the data flow between a computer's operating system and attached devices.
NOTE: To update the BIOS on your computer, go to the Lenovo website and download the correct BIOS for your machine. You can flash FL1 files on to your computer using the Winphlash program.