Dell Firmware Update Tool - ISpillMyDrink/UEFI-Repair-Guide GitHub Wiki
Dell firmware updates are usually delivered as executable files and are easiest extracted with the help of Dell PFS Extractor.
> python3 Dell_PFS_Extract.py /PATH/TO/INPUT.exe
As the extracted images are only part of a full SPI ROM image, they will need to be stitched together with the help of the backup image taken of the machine.