A little about libsmbios and firmware-tools.
BIOS and Firmware Updates
The firmware-tools project provides easy method of BIOS and firmware update.
Packages for firmware-tools and firmware-addon-dell for Debian and Ubuntu available in the Dell repository on linux.dell.com. Here is the main firmware-tools page: BIOS and Firmware Updates
You can manually update your BIOS using the dellBiosUpdate program in libsmbios with these instructions.
BIOS and Firmware Updates from a Fedora LiveCD
Here are instructions for generating a Fedora LiveCD that also contains all the Dell BIOS and firmware packages, and firmware-tools applications used for performing the update.