When I booted into System Services using F10 on a Dell PowerEdge T710 to run the Platform Update on the LifeCycle Controller (translation: the firmware connects to Dell's FTP site and downloads and installs firmware updates for you) I saw "The updates you are trying to apply are not Dell-authorized updates."
After the initial wry smile about Dell firmware connecting to a Dell site to download Dell drivers and then failing and calling them "not Dell-authorized," I proceeded to do the following: