I’ve tried with and without the power cord and it always seems to hang. I have attempted it on 2 different computers as well. I have had it successfully dump SHSH blobs previously but it seems to take forever and isn’t consistent.
just a quick fyi. i was having the same problem with 2 different atv2’s What i did to resolve it was plug into my tv turn on atv go to settings and reset them on the atv. then when i tried ifaith again it worked fine.
seems there is something that was messed up on both of them but right after reset problems were resovled
No problem for me using the ifaith 1.5.6, what I did is open iTunes and leave it there. Then put my Apple TV 2 to DFU, when it reach IBec I plugged in the power cord and it work. I don’t know if it work for everyone.
after restoring back to latest stock firmware ios 6.13 (5.2.1) (un jailbreak ) i tried using i faith 1.5.6 , iwas able to save the blobs of 5.2.1. Also after downgrading to Ios 6.1 (5.2) & try saving the blobs again still sucessfull.