Dell Inspiron/Latitude 5480 BIOS archive for board 17859-1, meant for the version with an 8th-generation processor according to the name, size 7.45 MB. Five-digit numbers with a dash suffix such as 17859-1 follow the Wistron pattern, the ODM that makes this board. The image serves to reprogram the SPI flash when the system stays dead or shows firmware errors. Check the CPU generation and board number on the PCB, back up the existing chip first, and confirm the image fits the flash capacity.
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 →