Main BIOS dump for the Dell Inspiron 3521, 4.00 MB in BIN format and marked as working in the name. It is the companion to the separate keyboard controller firmware for the same model. The 4 MB size matches a 32 Mbit SPI flash chip, which is programmed with a tool such as CH341A or RT809H when the laptop powers on without display or loops after a failed update. Back up the existing chip contents before writing, since service tag data may need to be transferred, and confirm the board revision matches.
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 @bios_laptop. Enginerys does not host this file.
How to open a .bin file
A raw, byte-for-byte image of a flash chip: the main BIOS / UEFI, the embedded-controller (EC) firmware, or both.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →