RAR archive holding BIOS and EC firmware for a Sony VAIO motherboard numbered MBX-223, described as working. MBX is Sony's own internal board designation, and the matching laptop model is not stated in the name. Keeping the embedded controller code together with the system BIOS matters, because a corrupted EC can cause no-power, charging or fan faults just as a bad BIOS causes no-boot symptoms. Extract the archive, compare each image size with its target chip, and back up both chips before programming them.
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 @schematiclaptopramkushwaha. 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 →