Embedded controller BIOS for an L421 model, saved as a 512 KB binary. The name marks it as EC firmware, separate from the main system BIOS in the same set, and the EC manages power-on, battery charging, fans and the keyboard. Depending on the board, it is written to a small dedicated SPI flash or into the controller with a suitable programmer. No board number is given, so confirm the motherboard first and read the existing EC contents before writing this image.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @bios_laptop. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →