Sony VAIO BIOS archive for the MBX-182 motherboard at revision 1.0, with M772 also listed, likely the internal board or model code from the PCB. The RAR is 1.10 MB and is used to reprogram the BIOS flash on that board, for instance after a corrupted update or for a password problem. Sony MBX numbers appear on the board silkscreen and should be compared along with the revision before writing. Always save a copy of the existing chip first, and make sure the image size matches the flash 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 @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 →