BIOS firmware image for a Sony VAIO laptop built on the MBX-218 motherboard, a Sony-numbered board. The name also carries the tokens 205 and GL40; GL40 most likely refers to the Intel GL40 chipset, though the name does not confirm it, and 205 is unexplained. The dump is 2 MB with no file extension, which suits a 16 Mbit SPI flash chip. Technicians write such images with a hardware programmer to recover a board that will not start after a corrupted BIOS. Read and save the original chip first, and check that the MBX number printed on the PCB matches.
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 @bios_laptop. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →