An 8 MB .bin firmware file for the 4540s model. The extra O in the name is not explained and could mean original, but treat that only as a guess. The name carries no board number, revision or firmware version. A file this size is normally a full image of a 64 Mbit SPI flash and is written with an external programmer. Before flashing, save a backup of the chip already on the board. Check the header and the descriptor in a hex editor, and make sure the PCB matches the laptop the dump came from.
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 @biosfilebins. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →