Il est recommandé de ne pas mettre à jour pour les 3 possesseurs d'Apple TV 2.
Voici les changements de la mise à jour 4.2.2 pour Apple TV 2 :
Audio Addresses an issue in which audio is not output when playing some video content.
Video playback Addresses an issue in which video is not displayed when playing some content.
Audio output setting Adds an audio output setting for switching to 16-bit audio for compatibility with some TVs and AV receivers.
Live FF/RW improvements Improves the performance of fast-forwarding and rewinding live events.
Movie description Addresses an issue in which the description information is not displayed for some movies.
YouTube video order Addresses an issue in which YouTube subscription videos were not ordered by date.
Aucune référence à une sécurité / jailbreak, mais pour plus de sécurité, évitez de faire la mise à jour.
Téléchargez tous les IPSW des iOS y compris l'iOS 4.2.2 ici.
Source : http://www.funkyspacemonkey.com/apple-drops-ios-422-appletv-2