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Yesterday Apple released a software update 4.2.1 for the second-generation Apple TV to address resolution problem caused by incorrect displaying of content and downloading issue that may cause a movie o TV show to be re-downloaded.  Some users noticed that the update might resolve also flickering issue. Some of users used a HDMI to DVI cable to watch the Apple TV content and after the update, the flickering was gone. Though, other users found that the update doesn't resolve their issues.