BIOS backup from a Lenovo IdeaPad S215, labeled with bm5291 and version 1.3, in a 1.71 MB ZIP. As a dump read from a working machine, it can restore a board with corrupted firmware when written to the SPI chip with a programmer. The bm5291 token probably refers to the board or project code; compare it with your unit. A backup from another machine may carry its serial data, so save your own original contents first, and check that the image size matches the flash 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 →