Lenovo G580 BIOS firmware in a 2.92 MB RAR archive, with no board number, revision or version given in the name. The G580 was produced on more than one motherboard design, so the exact board needs to be identified before using it. A dump like this is written to the SPI flash with a hardware programmer to fix a laptop that does not boot after firmware corruption. Read the board code printed on the PCB, extract and inspect the archive, save the original chip contents, and check the image size.
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 @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →