RAR archive of 1.78 MB labelled only 1558, which on its own does not identify a brand, model or board number with certainty. It is catalogued as BIOS or firmware, so the contents are likely a flash image for writing with an SPI programmer. Extract it and inspect the files before use, compare any image to the motherboard and chip actually being repaired, make a full backup of the original chip, and confirm that the image size matches the flash capacity, since a mismatched file will not fit.
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 →