JB a virgin ATV2 Running 5.2 software

How do i jail break my virgin atv2 running 5.2 software without upgrading the software to 5.2.1. Do i have to save my old firmware first. I jail break an apple tv2 before the 5.2.1 and it works fine untethered. Not sure how to do it i don’t want it to upgrade to the tethered version THANKS for any help guys.

This can be done by using the beta version of Seas0nPass.

More details here: http://forum.firecore.com/topic/10330