Main BIOS dump for the Sony VAIO VPCCB15FG, board MBX-239, in a 1.50 MB RAR archive. The word Main suggests the system BIOS image as opposed to a separate EC or keyboard controller firmware. MBX-239 is Sony internal board numbering used across several VAIO series. Technicians write such images to the SPI flash with a programmer when a laptop is stuck in a boot loop or shows no picture. Back up the original chip first, confirm the board marking, and verify the image size equals the chip capacity.
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 →