How to jailbreak Apple TV2 6.0 (6646.65)

Hello,

I have a apple TV2 ModelA1378 EMC411
On this Apple TV2 i have apple TV software 6.0 (6646.65). I have been told that you can jealbreak this to a Untethered Jailbreak.
How can i do this? What software must i use? Have someone a guide or the steps how i can do this?

Hoi Cyber16 thnxs for the link. But what to do now?
Where can i downgrade 6.0 (6646.65) to 5.3?