Nothing I can do until @avd replies

@Lost_N_BIOS @FMQ Hello! No, seccore from sage won't work here. You need this one - https://drive.google.com/drive/folders/1...rpr?usp=sharing
You also will need bios v2.x, not 3.x. v2.1 is the latest compatible bios. Modify seccore as is with UEFI Tool (UBU).
It should work, good luck.

@avd - thanks a lot for quick and in-depth info! What BIOS/where does this SECCore come from?
How are you supposed to find BIOS at Supermicro, I can't even see that latest BIOS "829" is a V3.xx BIOS, no way to find older BIOS there either, that site is terrible!
I go to support/downloads, trying to find manually, but there is no C621 chipset in the menu, and 620 doesn't show this model, and if I put in the model all I get is back to that original "latest BIOS 829"

* Edit - I assumed google would help me, but it's a fail. Can you please link me to 2.1 BIOS for this model.
Also, since he has programmer, I assume I can copy over his board details and he can program back in 2.1 edited that way, but is there anyway for him to directly "Flash" 2.1 first, then dump with programmer and send to me for editing?
Maybe through IMPI, or disable IMPI, or other method? If not, I can transfer details I'm sure, but it would be easier if he could flash 2.1 properly using normal flash methods, and then dump with programmer for me to edit.

I know SuperMicro 3.0a BIOS can through add MicroCode to Support ES CPU, maybe we can extract SuperMicro Version 3.0a BIOS Seccode add to X11SPA-T BIOS
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I want to have a try,but i can't Modify seccore

Link me to 3.0a and I will make for you, but avd knows what he's talking about on this I'm sure, so you probably need 2.1 BIOS that he mentioned. Try to find that if you can

this Link please

https://drive.google.com/open?id=1yPw3mf...PNLb9VNcq6BWz-s
this is motherboard SuperMicro X11Dai-N9 BIOS

That is not your motherboard or BIOS. So we wait for avd to reply with BIOS 2.1 for your model.

I already have correct SECCode to use, from avd above, once we have correct BIOS that works for your board and these CPU's (ie version 2.1) I can edit BIOS for you

Thanks

You're welcome. I can do now, if you can find 2.1 BIOS for your board? Maybe you have in old BIOS downloads? I tried to find at Supermicro site and in google, no luck