BIOS firmware for a Sony VAIO notebook with motherboard MBX-224, packed in a 1.65 MB ZIP. MBX numbers are Sony's own mainboard identifiers, printed on the PCB and used to match firmware and diagrams. The archive may contain a full chip dump for writing with an SPI programmer when the laptop fails to boot. Check the extracted file size against the flash chip, back up the original contents, and confirm the board label reads MBX-224.
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 @biosbigarchives. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →