You dont want anything like <A HREF="http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&p=667580#667580" target="_new">THIS</A> to happen to you. So i suggest u stick with the BIOS thats meant for ur revision.
<A HREF="http://www.asus.com.tw/support/download/item.aspx?ModelName=A7N8X" target="_new">U cud go to the A7N8X BIOS page here.</A>
<b>Take my advice, I don't use it anyway.</b>