With the latest BIOS 69 and 70 I have trouble posting a NUC7i7DNHE with an NVMe SSD connected and Legacy BIOS option set. Nothing happens. Just black screen after power on. It posts with NVMe SSD disconnected. I have had this problem now on several NUC7i7DNHE with several NVMe SSDs. It's 100% reproducable here. The problem is I can't revert back to an older BIOS version. It says "Incompatible BIOS version". I'm pretty sure 68 or at least 67 worked with Legacy Boot. Is there any workaround for reverting back to an older BIOS version?
Looks to me that Al is right. Read the Intel System Requirements for OS Installation on a PCIe* NVMe* SSD
To use as a bootable drive, you need:
OK, as you wish. You know better. You may downgrade your BIOS, using BIOS Recovery Method
You may use either of the two methods: BIOS Recovery by Power Button Menu or BIOS Recovery by Security Jumper
The OP needs to understand that GPT and UEFI Boot are listed as requirements for the use of NVMe devices. If he got it to work on these older BIOSs, this was purely happenstance. Well, changes have happened in the BIOS and now it doesn't appear to be working. Since GPT and UEFI Boot are listed as requirements for NVMe support, there is absolutely no chance that the NUC team will accept a bug report asking for the opposite to be supported. At the same time, support for Legacy Boot is being removed from some existing and certainly all future NUC products. Bottom line, do yourself a favor and move to GPT and UEFI Boot because support for Legacy Boot is about to disappear regardless of what you do and don't want.