I need some help please.

I have a supported SuperMicro X10SAE board that fully supports E3-1200V4 processors. I have another SuperMicro board, the X10SLH-N6-ST031, that was apparently some OEM board and the BIOS has not been updated to fully support E3-1200V4 processors. Both boards are based on the C236 chipset.
I have tried copying the E3-1200V4/Broadwell microcode to the X10SLH-N6-ST031 BIOS, but that was not enough to get my V4 CPU to work on the X10SLH-N6-ST031 board.

Question: In addition to microcode, what else should I copy from a known working BIOS (on the X10SAE) over to the X10SLH-N6-ST031 BIOS to enable the E3-1200V4 processors?

I'm new to BIOS modding. If this is covered in a guide somewhere, would someone please point me in the right direction, because I'm not sure what to look for. Thanks
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I've attached a BIOS I modded to include NVMe support (the NVMe support works) and E3-1200V4 microcode, but apparently just the microcode is not enough--this is where I could use some help. I'm hoping to learn what needs to be done, rather than just have someone do it, but if someone wants to help, I won't complain
For reference, The latest BIOS for the X10SAE board ( https://www.supermicro.com/en/products/motherboard/X10SAE ) works with the E3-1200V4 chips and has the same C226 chipset.

Would someone please help me get E3-1200V4 support working on the attached BIOS for the SuperMicro X10SLH-N6-ST031?

@mdog474 - Did you fix FIT after you inserted the microcode? If not, this may be the issue.
Or, you may need to ask them directly for custom BIOS, sometimes they will make for you

Please link me to the stock BIOS download page for this model, you have too many model names here for me to be sure what's what
Plus, Supermicro BIOS download packages often have different names than the actual board model, so always a mess for me with Supermicro if user does not link to BIOS download page

Ahh yes, FIT is broken in your attached file, this may not be the main/only issue, but this needs corrected before you can be sure simple ucode insert does not work here
Also, what is the exact E3 V4 CPU you are trying, there is no E3-1200V4. You did see there is four microcode volumes to be edited, correct? I don't have stock BIOS, so I can't compare, to see what you inserted/where

The X10SAE has totally different ME FW type (SPS v3 in your NVME mod above vs ME V9 in X10SAE), which you can't simply change, so if it comes down to this, there will be nothing you can do here

@Lost_N_BIOS Here is the most recent BIOS. The challenge is that the X10SLH-N6-ST031 is an OEM board and SuperMicro does not have a link available for the board or BIOS. I pulled this BIOS image off directly off the BIOS chip on my X10SLH-N6-ST031 board using a CH341APro.

I'd greatly appreciate your help in updating/fixing the E3-1200V4 support, and would love to understand what steps it takes to fix it so I could do it myself next time I run into a similar challenge.

BIOS from X10SLH-N6-ST031-orig.rom.zip is already has support for Broadwell.

@DeathBringer I have an E3-1285L V4 that does not work on the X10SLH-N6-ST031 with the X10SLH-N6-ST031-orig.rom loaded, and the E3-1285L V4 works fine on an X10SAE with the latest version of the BIOS for the X10SAE (The both have the same chipset: https://www.supermicro.com/en/products/motherboard/X10SAE ), so something must be missing/not up-to-date/not-quite-right on the X10SLH-N6-ST031-orig.rom BIOS.

@mdog474
That isn't microcode's issue. Because X10SLH-N6-ST031-orig.rom and latest BIOS for X10SAE (X10SAE8.525) use the same version of microcode.

@DeathBringer Do you have any idea what else could be causing issues? What about the FIT that @Lost_N_BIOS mentioned. I don't know how to check that. Maybe the FIT has issues in the X10SLH-N6-ST031-orig.rom BIOS.

@mdog474
X10SLH-N6-ST031-orig.rom has correct FIT, but your mod x10slh-n6-st031-nvme-v4.rom hasn't.

@DeathBringer Do you have any idea what I should check to try to figure out why X10SLH-N6-ST031-orig.rom won't POST with an E3-1285L V4?
Also, how do you check that the FIT is valid/correct?

@mdog474
Have you other Xeon E3-1200 V4 series?
BTW: I'm not a tutor.

@DeathBringer I only have one right now with a different model that should arrive in 1-2 weeks--I will try that one when it arrives.
Re: Tutoring--I'm not looking for private tutoring , but looking for pointers so I can learn to fish rather than have super-helpful folks like you do all the fishing for me.

Thanks for stopping in DeathBringer!

@mdog474 - Tonight, I will take your original dump and do NVME mod and update microcodes for you with fixed FIT, then you can see if that helps or not.
If it does not, there is nothing else I can do to help, maybe only DeathBringer can help with adding compatible CPUs that are possibly not compatible or blocked, I don't know anymore on doing this if/when microcode addition does not help.

You can see broken FIT in UEFITool NE version, compare before/after BIOS side by side and you will see the issue
I wrote a guide that is outdated on how to fix here, but you can still use it, if you don't want to wait on me to do this - [GUIDE] Update CPU Microcode + Fix FIT Using UEFITool / Hex
The guide is only outdated, because you can now get the correct offset much easier and no math needed, by using UEFITool NE 55 (I think) up to 57 (for sure), I just have not had time to update with the new info/method.

* Edit - I suspect, the ME FW type may be part of the issue here, I've seen broadwell working on regular ME FW but have never seen it on SPS ME FW (it may be possible, just I've never seen, but I also don't look at this often either, so it may be fine and common too)
But, this isn't something you can change, the ME FW type. However, if it's just a setting in ME FW, that you can change, but I doubt it would be just a setting, if the ME FW in general is part of the issue

@Lost_N_BIOS Thanks for the tips and I'll try out your modded BIOS once it's posted and report back!