Firmware dump for a Sony VAIO board MBX-202, with M791 given in brackets as the internal model or project code, packed in a RAR of about 790 KB. MBX numbers are Sony's own board identifiers. The small size suggests a compressed BIOS image or an EC file, so inspect the archive contents before planning a flash. Technicians use such dumps to rewrite a corrupted chip with a programmer. Confirm the MBX and M-code labels on your board, save the original chip, and ensure the image size matches.
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 →