Asus M4N78 Pro EDIT - Confirmed working after all. I evidently was making a typo somewhere! Thanks for your help!
@ipmark: Let's do it Anyway what's the risk, my motherboard has a recovery bios system that prevent this kind of thing and I just checked, all the intel OROM bios are > to 110kb since 10.5 so I don't really have a choice :-/ What kind of utility do you recommend me to use to flash, the one provided by Asus running in windows or bootable one? Thanks.