Firmware image for the Dell Inspiron 15-3558, made for the Wistron-designed board numbered 14216-1, delivered as a 4.57 MB zip. The five-digit number with a dash revision is the typical Wistron board code that Dell prints on the PCB. A dump like this is written to the BIOS SPI flash with a hardware programmer such as a CH341A when the laptop will not post or after a bad update. Back up the existing chip contents first, keep the original service tag data, and confirm the unpacked image matches the chip size.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →