Firmware archive with the uninformative name MSSR, 955 KB RAR; no device, brand, board number or version is stated. The small size suggests an EC image, a small SPI dump or a TV or monitor firmware rather than a full modern laptop BIOS. Open it and look for identifying strings in a hex editor before deciding where it belongs. Never write an unidentified image to a chip: read and save the original contents with a programmer first, and ensure the image size equals the target chip 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 @tvcodeservice. 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 →