Firmware archive for the ASUS S551LN, with F1 and 209 in the name, most likely a BIOS version 209 for that model, though the name gives no board revision. Images like this are used to restore a flash chip that has been corrupted or to replace a dump with a damaged ME region. A factory capsule file may need conversion before a programmer can write it, so check the size against the SPI chip first. Compare the PCB revision, save the original chip contents, and verify after writing.
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 →