Hello. I have Win 10 OSD working perfectly on computers using Legacy BIOS mode. Recently I have had to migrate all devices to UEFI BIOS mode.
OSD using UEFI mode works perfectly (exactly like in Legacy BIOS mode) when the computer being imaged has a blank disk (i.e. I run Diskpart > Select Disk 0 > Clean).
However if I want to reimage the same computer it will fail to PXE boot with Error "PXE-E18: PXE server response timeout".
If I wipe the disk, then UEFI PXE works just as it did before, and OSD works as expected.
I do not understand why it is doing this in this specific scenario.
My environment:
1. SCCM 2012 R2 SP1 standalone site on 10.10.100.112. DP with PXE is installed on this server
2. DHCP installed on DC with IP 10.10.100.10. DHCP Scope does not have Options 60, 66 or 67 which is correct since SCCM DP and DHCP server are on the same subnet.
3. OS Deployment is using ask Task Sequence based on MDT 2013 Update 1, with WDK 10. The OS Image being deployed is a Windows 10 Build 1511 Enterprise x64. The boot images are working fine and distributed to the DP's etc.
4. The computer being imaged is an HP Probook 650 G1 (very recent model) and has full UEFI BIOS enabled with all CSM modules disabled
5. The OSD Task Sequence enables Bitlocker. However I have tried this with no Bitlocker enabled with the same result.
I am stumped! Can anyone suggest something I am missing? Thanks in advance!