How to Jailbreak Apple TV 2G on iOS 4.2.1 with Seas0nPass [Guide]

FireCore team has come up with a PwnageTool like program to build custom jailbroken .ipsw files for your second-gen Apple TV. Like almost all jailbreaks for iOS 4.2.1, Seas0nPass  jailbreak is also limited to tethered-boot for now.