Yesterday’s Apple TV update broke the awesome PlexConnect hack that allowed a fully-functional Plex client on non-jailbroken Apple TV 2 and Apple TV 3. It seems that Apple fixed the Trailer app vulnerability. According to Cult of Mac:
Apple has just updated the second and third-generation Apple TV software to version 5.1 (build 10A406e). The biggest changes include support for Shared Photo Streams, the ability to switch between iTunes accounts and to send audio content from Apple TV to AirPlay-enabled speakers and devices. Apple TV 2 jailbreakers: as always – stay away from this update for now if you don’t want to lose your jailbreak.