I just received my new HTPC Platorm (Asrock J4105-ITX) and had to notice that this board has no legacy boot options. For the last couple of years I have been booting LE via PXE and now I can't. Do you have any clue how to make that work? Do I have to put an .efi file in my boot directory on the server? Please let me know if you have any questions.
Edit: I managed to boot via PXE in UEFI mode by pointing to the correct syslinux.efi file in dhcp options. But PXE Boot via UEFI is slow as hell. Found many people complaining about bad performance in UEFI mode but did not find a solution yet.