BIOS dump for a Sony VAIO PCG-61B11W built on the Sony MBX-253 motherboard, archived as a 980 KB RAR file and marked OK, meaning it was reported as working. MBX numbers are Sony's own board identifiers, and several VAIO models share one board, so check the MBX code on the PCB rather than relying on the model alone. Technicians use such images to recover a board with corrupted firmware by writing the SPI chip with a programmer. Back up the existing contents first and compare image and chip sizes.
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 →