Sony Vaio BIOS for mainboard MBX-270, delivered in a 3.10 MB RAR archive. Sony's MBX numbering identifies its laptop boards and is printed on the PCB, often next to the ODM code. No laptop model is stated in the name, so match the board marking and inspect the extracted files. Use it to reflash the SPI chip of a board that will not start; read and keep the original contents first and make sure 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 →