ASUS K541U BIOS, also identified as X541UVK, at firmware version 308, supplied as an 8 MB file without an extension. ASUS sells the same board under several model names, so confirm the mainboard model and revision printed on the PCB. A file of this size usually matches a 64 Mbit SPI flash chip and can be written with an external programmer to recover a non-booting laptop. Read and back up the original chip first, because it holds serial and system data, and verify the size match.
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 @BiosSchematicWorld. Enginerys does not host this file.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →