BIOS archive for the Sony VAIO SVT131B11W on board MBX-265, packed as a 3.24 MB RAR. The MBX prefix is Sony's own board numbering, shared by a range of SVT13 ultrabooks. Technicians use such a dump to reprogram the SPI flash with a programmer after a failed update, corruption or a password lock. Since the name gives no version, open the archive and inspect the image first. Verify the board number on the PCB, keep a backup of the original chip, and check that the 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 →