This video is literally all i know of it, i know nothing of jtagging the xbox and probably never will.
[video=youtube;t7iZ_SBbe_4]http://www.youtube.com/watch?v=t7iZ_SBbe_4[/video]
[video=youtube;HlT2EJubHWo]http://www.youtube.com/watch?v=HlT2EJubHWo&feature=channel&list=UL[/video]
Ideally, its better to have two xboxs if you are into modding them these days.
One for legit online play and the other for flashing, jtagging and so on.