BIOS firmware archive for the Sony Vaio VPCCW13FD built on the MBX-214 mainboard, with the name also noting M870 and an Nvidia graphics variant. MBX numbers are Sony's own mainboard designations, so compare the code printed on the PCB before using the image. Inside the RAR a technician should expect a dump intended for reprogramming the SPI BIOS chip with an external programmer. Read and save the original chip contents first, and confirm the image size matches the flash capacity before writing anything.
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 →