Follow this YT jailbreaking video http://www.youtube.com/watch?v=4EWKr7Ww_c0 If you want to use the above YT video default filenames/code make sure AppleTV2,1_4.2.1 _8C154_Custom_Restore.ipsw is correct. Watch the spaces etc. * If you get messages from the terminal such as, 'unknown directory' etc then confirm that what you copied is what ended up getting pasted into Terminal. Some text editing programs add strange formatting when pasting. This should work for you. Code: unzip -j /Users/USERNAME/Desktop/AppleTV2,1_4.2.1_8C154_Custom_Restore.ipsw Firmware/dfu/iBSS.k66ap.RELEASE.dfu kernelcache.release.k66 -d /Users/USERNAME/Desktop/ Then install aTVFlash (Black) from these guys. Comes with a version of Plex that plays everything. http://support.firecore.com/entries/313334-pre-install-requirements This is a tethered JB which means if you unplug your aTV2 from the power source you'll have to run command #3 again. For me it's no problem because I have no reason to unplug my aTV2. I have 4TB of blu-ray movies, Photos etc and all formats streaming wirelessly from my AEBS to flat screen TV. Including everything from the Apple store and all Apple formats of course lol This is no joke. I'm quite proficient with OS X but by no means a "hacker". This was very easy. Took 20 minutes. If you're scared don't worry. You can simply restore your aTV2 from iTunes. Good luck!