Firmware dump for a Sony VAIO on the MBX-250 board, noted as an Intel Core i5 version and marked Z40HR MB, delivered in a RAR of about 1.86 MB. The MBX number Sony prints on the PCB should match, as CPU and graphics options can mean different firmware. Technicians write such dumps to the SPI chip with a programmer to recover from a failed update or no-boot condition. Read and save the original chip first, and check the image size fits the chip before writing.
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 →