Firmware archive for model PCG-4121L with an Intel Core i3 and onboard ATI graphics, in a 1.57 MB RAR. PCG codes are Sony VAIO regulatory model numbers, but the name gives no board number or revision, so check the mainboard code on the PCB. The graphics note matters because boards with discrete and integrated video often use different BIOS images. Write the dump to the SPI flash with a programmer only after reading and backing up the original chip and confirming the file size matches its 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 →