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Sep 28, 2016 7:14 AM in response to "Birdman"by JimmyCMPIT,if you modified or disabled and want it reset it you should restore the OS to a factory state using the recovery
About OS X Recovery - Apple Support
more on crustily
About System Integrity Protection on your Mac - Apple Support
NetBoot, NetInstall, and NetRestore requirements in OS X El Capitan - Apple Support