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In this video I give a full overview of iOS 4.2.1 for the iPod touch 4G. iOS 4.2.1 brings with it several key improvements such as AirPlay which allows you to stream music, pictures and video to another AirPlay enabled device such as the Apple TV. It also supports AirPrint, allowing you to print wirelessly from your iPhone, iPod touch or iPad. There also are several smaller improvements and additions in the update such as increased speed and stability.