I have a Surface Pro 3 with a docking station. When I want to install Windows 8.1 Enterprise for building an image I get, when I want to boot from PXE (start PXE over IPv4), the (error) message
"Secure boot Violation - Invalid signature detected. Check Secure Boot Policy in Setup". When I enter OK it boots further with "start PXE over IPv6". This takes a while and then start the default OS.
I have updated to the latest firmware but no luck so far, anyone?