Dell POWEREDGE R710 - Manual (Page 7)

PowerEdge Deployment Guide
Page 5
This error continues even after ensuring that all needed drivers are added to the PreSystem directory. The solution
for this issue is to use WinPE instead of the default deployment agent. See the following Microsoft knowledge
base article:
http://support.microsoft.com/?id=970721
Using UEFI
For additional information about using UEFI, see Deploying UEFI-Aware Operating Systems on Eleventh Generation
Dell
TM PowerEdge TM Servers.