Compressed archive of roughly 1.8 MB labelled for the Lenovo G505 and G405, which suggests firmware shared by both models; the name gives no board number, revision or version. Extract it and inspect the files to see whether a BIOS image, EC firmware or tools are inside. Before programming any SPI chip, match the board markings to the image, make a backup of the original chip and confirm the image size equals the chip capacity, since a mismatched image will not fit or boot.
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 →