Following the Mac OS X 10.6.7 update, Apple team has released a minor firmware update (iOS 4.2.1) for Apple TV users. This new update addresses the graphics bug on older devices.

Apart from that, Apple team has also provided few more bug fixes and performance improvements in iOS 4.2.1 update for Apple TV. The details are as follows -
- TV compatibility: addresses issues that may cause the screen to flicker or display incorrect color on some older TVs.
- Wake from sleep: addresses a problem in which the Apple TV may not wake up from sleep.
- Audio: addresses an issue in which 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.
Download iOS 4.2.1 for Apple TV
If you haven’t download iOS 4.3 firmware update for iPod Touch, iPad and iPhone, you can download it from here.
