Apple TV Jailbreaking newbie question?

my brother has bought appletv2, , wants jailbreak run plex , or xbmc.

point me in direction of latest documentation of how this?

links seem find on 2 years old.

 

this thread has pretty walkthrough:
http://forums.macrumors.com/showthread.php?t=1305573

there's iclarified

 

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