Main system BIOS for an L421 model, a 4 MB binary sized for a 32 Mbit SPI flash chip. It pairs with the separate EC image found under the same model name, and both may need flashing when a board is fully dead. No board number, revision or version appears in the name, so match the motherboard by its PCB markings. Use an external programmer with a clip or remove the chip, and make a backup of the original contents before writing.
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 →