ok, i have a new System Center Configuration Manager 2012 R2 CU4 install. i am unable to get surface 2 or 3 to pxe boot. i can get a hp laptop in uefi mode to pxe boo every time. the surface will not get past the PXE screen. you can see in the smspxe log that the sccm server offers a image but the surface never accepts it.