Backup BIOS dump from a Lenovo IdeaPad S405, according to the name. No board number, revision or chip type is given. The RAR is 2.10 MB, and as a backup it likely holds a read from a working machine, which is useful for restoring firmware on the same model. Check the image size against the flash chip on your board, and compare the board markings with the S405 before relying on it. Save your own chip's contents first, since serial and system data in a donor dump will differ.
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 @afsbiosfree. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →