but problem is that during boot keyboard is not functional as I wrote. You can try it yourself (as sylvia_intel in previuos mentioned thread), if you set in BIOS "Internal EFI shell". Then NUC doesn't turn keyboard and only boots into EFI shell screen. I think that it is bug in BIOS - during boots to "EFI shell" is keyboard not detected.
Thanks for the update.
I have been able to boot setting up Internal EFI shell, but thanks for the feedback and I will communicate this matter to our engineering team.