Firmware archive for the Sony VAIO motherboard MBX-224, following Sony's own MBX board numbering used across many VAIO models. At 1.65 MB compressed, it likely contains a raw BIOS image for the board's SPI flash and possibly related files. Technicians use it to reprogram a corrupted BIOS chip with a programmer when the laptop powers on but does not POST. Make sure the MBX number on the PCB matches, since several VAIO series used different boards, and read out the original chip first.
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 →