I had a very strange issue. After updating to MDT 2013 and ADK 8.1 wen a client response getting error PXE-T04: Access Violation” and “PXE-E36: Error Received.
Solution:
Uninstalling WDS role
Reboot
Installing WDS role
Configuring WDS
Add MDT boot Images.
It works again.
WDS was corrupted Great 