@Ionstream ,
>this is a SuperMicro board
MMTool won't work with it. I've successfully modded X10DRi-T by an algorithm described at the beginning of this thread, when you manually modify 2 bytes of the microcode signature so it is no longer recognized as 306F2. There're four f2 06 03 00 sequences in this bios, and you need to change 2nd and 3rd ones (but always re-check bios validity with all tools available after this, yours may have different structure).
Hmmm that's interesting, must've missed it out while reading through this massive thread. I'll have a go at it.