On September 20th, Apple released a software update for the Apple TV that brought iTunes Radio, iTunes Store, AirPlay from iCloud and more. The software update was soon pulled after users complained of bricked devices and lost content.
A new build of the 6.0 firmware numbered 11A502 has been posted. The previous build was 11A470e.
Here are the Apple TV Firmware Download Links or you can select Software Update from Settings on your device.