BIOS firmware for the Dell Inspiron 3540 built on Compal board LA-A491P, revision 1, supplied as a 3.59 MB RAR archive. Compal uses the LA-xxxxP numbering for its laptop mainboards, and the code is printed on the PCB near the edge or under the memory slots. A dump like this helps when a machine powers on without display or loops after a failed update. Check that the board number and revision match, back up the existing SPI chip, and make sure the image size equals the flash capacity 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 →