Since alot of you guys are requesting how to install kodi, here is how easy it is to install using nitoTV which should be already added inside of your AppleTV2,
Things you need:
1. How to Untethered Jailbreak AppleTV2 iOS 5.3 http://goo.gl/isaqjT
2. Tell Difference Which AppleTV your Holding ( AppleTV 2 or The New AppleTV 3) http://goo.gl/F5qXtx
3. Install XBMC and nitoTV via Nito Installer
http://goo.gl/JzQgpR
4. Install aTV Flash (Black) 2.3 – AppleTV2
http://goo.gl/zAynjI