Yes, you can install certificate Asus_xxxxxxx.xrm-ms (you find it in a mod bios folder) copy it in c:\ Start, cmd Type slmgr.vbs -ilc c:\Asus_xxxxxxx.xrm-ms and press Enter
I understand your problem.....your ethernet don't work with modded bios!! I know only Amitool method for mod your bios....so i'm sorry for you, but I cannot help you I hope for you, an advanced member modified your bios with other method!