I received the new unit and the Wifi card problem is fixed but now it's even worse because it still cannot boot on network on the original bios (0018). Same error message, so I guess it's not a BIOS related issue.
I used a Netgear GS108 and also tested on a Netgear GS108E as a switch. I'm quite sure it is not a compatibility problem since I tried the PXE TFTP server on two other computer (other brand and model, using a Realtek PXE) and it was working flawlessly.
What happened between the time the PXE was working on the NUC and the moment it couldn't even detect the DHCP... Please Intel help help help... You should have the greatest engineers on this planet, so I'm sure you can fix this!!