EG-31M-S2 v1.0 Ahci mod?

Hi to all, I am trying to get my old G31 mobo to run with an intel Xeon 771, and standart f3 bios is going fine, but no ahci can be activated, so I guess if there is a chance to be unlocked here, if there is a chance, I am going to ask.

Motherboard Make/Model Gigabyte GA-EG31M-S2 v1.0
Bios Version You Want Modding F3
Link To Official Bios Download BIOS F3 Version

I also give the Gigabyte url to get bios in others servers:

Gigabyte GA-EG31M-S2 v1.0 BIOS site