Compressed firmware for a Sony VAIO built on the MBX-237 mainboard, a 54.2 KB zip. At this size the archive is too small to hold a full BIOS image, so it likely contains an EC firmware or a compressed partial dump, which should be confirmed after unpacking. MBX is Sony's own mainboard numbering for VAIO laptops. Verify that the board is MBX-237, identify the target chip, and keep a backup of the original contents before programming.
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 .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 →