Firmware for Sony MBX-239 motherboard, marked V050 together with the code 1p-0113j00-8011, which resembles a Sony part or PCB reference. Sony uses MBX board numbers across its VAIO range, and this board appears in the CA series. The 1.57 MB ZIP is meant for writing to the flash chip with an SPI programmer. Match the board code and reference printed on the PCB, save the original dump first, and make sure the image size equals the capacity of the installed chip.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →