If your Apple TV won't start up properly, or you are a developer who wants to install a tvOS beta, you must first put your set-top box in recovery (DFU) mode. As is the case with iPhone, iPod touch and iPad devices, entering DFU mode makes a malfunctioning Apple TV discoverable in desktop iTunes so you can restore it to factory settings, downgrade to an earlier version of the software or side-load a beta firmware onto it.
The method to put an Apple TV into DFU mode differs from that for other iOS devices. In this post, you'll learn how to put an Apple TV into recovery mode so you can restore it to factory settings if it's acting up.