Backup BIOS dump from a Dell 5423 (Inspiron/Vostro range) on board DMB40, number 11289-1, described in the name as a working backup, archived as a rar of about 3.7 MB. The 11289-1 format matches Wistron's board numbering, and Wistron supplies many Dell boards. Use it to reprogram the SPI flash with a programmer when the original firmware is corrupted. Read and keep your own chip contents first, since service tag data may differ. Check that the board number and the chip capacity match 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 @BiosSchematicWorld. 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 →