Sony VAIO firmware archive for the board numbered MBX-237, following Sony's own MBX motherboard numbering. At only 54.2 KB the ZIP is too small for a full BIOS image, so it most likely contains an EC or keyboard controller firmware, a partial region or a small configuration dump; inspect the contents before writing anything. Confirm the MBX number on the PCB silkscreen matches, identify the target chip, and back up the existing contents with your programmer so the original can be restored if the flash does not behave as expected.
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 →