The following link indicates that the version 3 parameters include a "-silent" option for the USBFile utility.
But the latest SDK readme no longer shows a silent option. What happened to it? Is there still a published version of the USBFile utility that supports AMT 6 functions like KVM that still has the silent option? If yes, can you share download link please?
Are you referring to the Symantec Connect posting at http://www.symantec.com/connect/articles/readyalternative-approaches-and-tools-configuring-intel-vpro-technology
It does appear the USBfile -silent option was removed from the latest build.
Since the SDK targets developers - please submit a request\note at http://software.intel.com/en-us/articles/download-the-latest-intel-amt-software-development-kit-sdk/