|With Dells, you are lucky. They have an option to go back to the original version of the BIOS just in case this sort of thing happens. Call Dell and they can walk you through it.|
Dell got smart. Along with being able to flash the BIOS to a new version, they have a non corruptable version of the original BIOS version permanently programed in to the CMOS chip that you can revert to just in case of power failure, pebcak error, etc.