Tiny 2-byte companion file to a firmware backup labelled 15 EH, holding the saved status-register value of the SPI flash chip. Some programmer software writes this beside a dump so the chip's protection and configuration bits can be restored. It contains no BIOS code and cannot be flashed on its own. Keep it with the matching 16 MB backup image, and restore the status register only if the chip's write protection or quad-enable setting needs to match the original.
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 @schematiclaptopramkushwaha. 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 →