Apple has released iOS 4.2.2 for Apple TV 2G users and this latest Apple TV iOS update is listed as 4.2.2 build 8F305 and includes some fixes certain bugs and errors existent in the preceding version.
Apple TV 2G users can grab the latest OS update through integrated link below and visit official Apple web page for support document.
Download iOS 4.2.2 for Apple TV 2G
How to update iOS 4.2.2 in Apple TV 2G
In order to upgrade to iOS 4.2.2 on Apple TV 2G the user needs to Open the Settings -> General. Now select the “Update Software” and in the next message prompted hit the button “Update and Install”. The iOS 4.2.2 will be upgraded on Apple TV 2G automatically.