Lenovo BIOS archive for a board identified as BM5736, version 1.4, compressed as RAR at about 9 MB. The name does not give the PC model, so the board code printed on the PCB is the main way to confirm compatibility. A technician uses a file like this to reflash the SPI chip of a desktop that fails to POST or has a corrupted firmware region. Check that the board version is 1.4, read and keep the original chip contents, and compare the image size with the flash capacity.
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 →