UEFI not booting

[NiKiZe]

Does your machine boot in efi mode, and does it do the PXE over efi?
One way to check this is that the dhcp option Arch (I think it is option 93) is correct for efi in the packet dumps (at least non 0)

Also check that you see something similar to below, especially "PXE Network Boot using IPv4" I think all EFI implementations is specific about it being IPv4 or IPv6 if that is what you are using (in that case I think the option for arch above is different)