BIOS firmware for the Lenovo IdeaPad S100 netbook on board BM5080, revision 1.2, contained in a 1.02 MB rar archive. The BM5080 code identifies the mainboard, so check that the code and revision printed on the PCB match. Recovery is typically done by writing the image to the SPI flash with a programmer such as a CH341A after a brick or corruption. Make a backup read of the existing chip first, verify it twice, and confirm that the image size suits the chip before programming.
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 .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 →