Firmware set for the ASUS X541NA, revision 2.1, containing both the main BIOS and the EC (embedded controller) firmware, in a 5.65 MB rar archive. Having both images matters, because a corrupt EC can cause no-power, charging or keyboard faults even when the main BIOS is fine. Each image is written to its own chip with a programmer, the main BIOS to the SPI flash and the EC code to its matching chip. Back up both originals, confirm the board says rev 2.1, and check each file size against 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 →