Apple released iOS 4.2.1 for Apple TV (downloadable from the set-top-box ) implements the following enhancements:
– New version fixes some problems with the flickering screen, the "awakening" of the device and the audio output.
– TV compatibility: Addresses issues that may cause the screen to flicker or display incorrect color on some older TVs.
– Wake from sleep: Addresses an issue where Apple TV may not wake up from sleep.
– Audio: Addresses an issue where audio may not be heard on some TV models after switching from another input.
– Stability and performance: Apple TV Software Update 4.2.1 includes stability and performance fixes for Apple TV.