Firmware archive for the Dell Inspiron 15 3521, regulatory model P28F, packed as a 3.19 MB RAR. The catalogue links it to motherboard LA-9104P, a number in the Compal LA-xxxxP style, indicating Compal built the board. A dump like this is used to restore the SPI BIOS chip with a programmer after corruption, a failed flash or a password lockout. Inspect the LA number on the PCB before use, since Dell sometimes shipped one model on different boards, and keep a backup of the original chip contents before writing.
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 →