ASUS K401LB main board firmware, revision 2.0, containing both the BIOS image and the EC (embedded controller) firmware. The EC controls power sequencing, battery charging and the keyboard, so a bad EC image can leave the laptop dead even when the BIOS is fine. The 3.55 MB RAR is meant for reprogramming both chips with a hardware programmer. Check the revision on the PCB, read and save the original contents of each chip before writing, and confirm each file's size matches its target 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 .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 →