Comment 13 for bug 1310406

@Gianluca:

You can grab the latest bios version from http://is.gd/XqTq1B, but unfortunately I did this in one of my friend's PC, and he still had a Win partition, then I used that not to spend too time to figure out another solution.

Although this laptop has a WinPhlash bios, then I think you can also use safely a FreeDOS disk (or usb dongle) with the phlash16.exe utility and the bios file (the ZD13813.wph, probalby renamed as BIOS.wph).

Looking around I've seen that there are multiple ways to obtain the phlash16.exe utility, check this one mentioned on the Ubuntu wiki:
 - https://wiki.ubuntu.com/DellBIOS#Obtaining_and_using_an_image_from_the_WinPhlash_utility