Add Broadwell support to Fujitsu D3348B1X

I bought a Fujitsu D3348-B1X thinking that it will support my V4 Xeon but now it's clear it only officially supports V3 Haswell. 

 Fujitsu released a newer board D3348-B2X which is very similar but has some differences ( the mention the TPM for instance ). 

 I'd like to add support for Broadwell to my D3348-B1X as I think the harware is perfectly capable ( has Intel C612 ). 
 I understand that just adding Broadwell microcodes to it might not be enough ( I'm curious what else is needed ) .
 One option would be to use some tools and mod the D3348-B2X BIOS ( seems like AMI BIOS so MMTOOL or UBU ? ).

 I'd appreciate any ideas on how to proceed. I'm willing to do the work myself but I could use some pointers.

 Attaching latest B1x and B2x BIOS files.

  D3348-B2.ROM.zip (Size: 3.89 MB / Downloads: 1)

  D3348-B1.ROM.zip (Size: 3.54 MB / Downloads: 1)