BIOS archive for the Sony VAIO VPCYB2L1R, model number PCG-31311V, with no motherboard number in the name. Sony uses the PCG code as the service model, so match it with the label under the laptop and the board marking. The roughly 1 MB archive is used to recover a corrupted BIOS chip by writing it with an SPI programmer. Read and save the existing chip before writing, check that the extracted image matches the flash capacity, and verify after programming before testing the board.
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 →