Zip archive of 3.52 MB whose name refers only to 4540s, most likely an HP ProBook 4540s, with no board number, version or contents listed. Unpack it and check what images it holds, since HP archives may contain a full SPI dump, update files or both. A full flash dump is written with an external programmer to the BIOS chip, and its size must match the chip capacity. Check the board markings and back up the existing firmware before flashing.
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 →