Optiplex 755 Quad-Xeon Bios Mod!

Hey guys, I'm new to this forum. I have a Dell Optiplex that currently has a Core 2 Duo in it, and I want to do the Xeon LGA771 to LGA775 mod. Before I buy the processor and mod sticker, I want to know if my BIOS will support it or not, and if not can someone make a mod for me? It is Dell's A22 I believe, if not I will upgrade to it. I know nothing about BIOS mods.

I just don't want to waste money on it if the BIOS won't work. So someone please just download the Optiplex 755 A22 bios and mod it for me or something