Rar archive of 780 KB with firmware for a Sony VAIO MBX-189 motherboard, M760 variant. The MBX-189 platform exists in several M-series versions, and M760 should match the label on your board, since images from other variants may not work. Unpack and confirm the image size against the SPI flash chip before programming it with an external programmer. Keep a backup of the original chip so you can roll back if the board fails to start.
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 →