Bios Mods -The Best BIOS Update and Modification Source

Hi,
I need help with my motherboard Gigabyte EP45T-UD3R. I need to insert 4 Xeons microcodes into latest BIOS, but I do not know how to do it? The problem is that lastes BIOS file for this motherboard has ending          .F8          I need ending       .ROM     to work with BIOS file in MMtool, when I changed the ending of the BIOS to     .ROM           , MMtool showed error during load BIOS. I tried to download BIOS from motherboard on deskopt, this BIOS file had ending        .ROM      but MMtool showe error again. 

Thanks in advance for every suggestion.

It's Award BIOS, MMTool can't open it.
You can use IdeaFix's mod or genius239's mod.

Thanks for your reply. Can you write me please instructions how to insert Xeons microcodes? Which program did you use? Thank you so much.