Glad it worked!
For future reference (for you and everyone else who's helped me in the past and could use the info)...
Supermicro's way works just fine. Setting boot mode to "dual" gives you the flexibility to boot from a source that's not formatted for UEFI booting, like a DOS formatted USB stick containing a BIOS update for example. So, that's their preferred method..maximum flexibility. I suppose they can't assume that users have paid the license fee (or generated their own licence
) to update the BIOS over IPMI, so they need to keep that option open to folks.
What they forgot to tell you is that in DUAL mode, you have to ensure that your system selects the UEFI enabled boot option for any media that can boot in both UEFI or Legacy mode, a Windows Server install ISO for example.
When you boot the system, hit F11 and pick a "UEFI" source. Here's the F11 Boot Menu from my X10SRH-CF that I'm reinstalling to bare metal today. Its set to DUAL mode and there's a single SanDisk USB stick plugged in. But that USB can boot in either mode, so its listed twice. I need to pick "UEFI: SanDisk, Partition 1". If it boots to "SanDisk" then its going to be in Legacy mode and won't be able to install to an NVMe drive. I believe that some Supermicro boards in "DUAL" mode look for the Legacy boot option by default, so you have to override it.
View attachment 30014
I can't believe how often Supermicro support puts people on the right track, then skips a step somewhere in the middle!
Should you need it in the future, "DUAL" setting they referred you to should be in the "BOOT" screen of the BIOS. This one from my X10SRH-CF on BIOS 3.2. Its a pretty common thing for boards from this generation. Sometimes it will be some form of "UEFI" plus "Legacy" or "CSM" instead of "DUAL". On some motherboards (including my X10SRH-CF), you also need to enable "CSM support" in the "Security>Secure Boot Menu" section of the BIOS for "DUAL" to even be a selectable option on the "BOOT" menu as below.
View attachment 30016
Cheers!