Like many here, my ATV2 somehow got updated to 6.0.2. And then I tried - many, many times - to crack it with the latest 5.3 Seas0n Pass.
I was trying on a MacBook Pro running 10.6.8. Sometimes I’d get about halfway there, followed by an error. Finally, after about 20 tries, I decided to try it on my desktop machine running Mavericks OS.
When I launched Seas0n Pass, it re-downloaded the 5.3 restore IPSW file. And then - to my surprise - everything worked. It all worked.
If you are having a rough time with 6.0.2, see if you can find a Mac pal running Mavericks. Worked for me - and I was pretty close to giving up. (Worked first time, too.)