I HAVE THE EXACT SAME PROBLEM! I just joined this forum just so I can ask the OP what he tried...
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Initially, I was able to install Windows 10, under 1.0b version of bios. I decided to update to 3.2 version bios (without first updating IPMI firmware to 2.0+ before getting a bios version that is 2.0+ as per instruction..). Upon bios update at the end, there as message on the DOS saying - Error when sending enable message to ME. I also tried with 3.0b and 2.0 version bios, but exactly same issue with the bios update at the end. My actual bios information would show that updates were successful each time... I was later able to successfully update IPMI firmware to 2.0+. I still get the same error message with bios update at the end. I am not sure if this has any relationship...
With any of these 2.0+ bios, including 3.2, I cannot even launch the Windows setup for 8.1 or 10 in the first place. I will see the Windows wheel come on and rotate like half a circle and give me the error code exactly the same. So other's method to try to install without LAN connected is nonsense... Windows 7 installation process actually works! I didn't get to actually install the 7 and see if I can actually boot the bios. Win 8.1 and 10 were all tried using bootable USB - and these are 100% perfect bootable USB setup, nothing wrong with ISO or USB themselves.
I also have a drive that already has Win 10 installed from another machine. When I try to load that up, I get the same error message right away, as soon as Windows takes over from bios post.
With logical deduction, knowing that bios 1.0b allowed Windows 10 to initially install, and the fact that there is no hardware or bios settings change, the issue I think has to do with the bios itself. Bios versions 2.0, 3.0b, and 3.2 are not letting me install Windows 8.1 or 10 on both legacy and UEFI methods. I cannot find bios 1.0b version online to reflash to retest installing Win 10. I also played around with every combination of bios settings available, multiple USB drives, etc. Really with no hardware change, somehow these "new" bios or bios updates are locking the systems down from installing Win 8.1 or 10.
I did not get a chance to talk to Supermicro yet.
Anyone else have any idea what I can try??? Thanks!