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Go to this thread I jail broke 5.2 with snowbreze
here is answer for you…
But I haven’t got shsh blob from my Apple TV. Is this possible to get now, or is that something that had to e saved before updating?
If its possible now; how?!
no, if haven’t jailbroken the unit before with a flash then u just have to wait until a jail break is available. sometimes it takes days to a week sometimes it take months. hopefully apple hasn’t sealed all of the exploits in that case never
if you ATV never been jailbreak before mean you can’t do anything now have to wait until new jailbreak coming out no other option or otherway around it… you can not used some one blobs as well as each device has it own unique ID to pay pass itune…
The difference in Apple tv and iphone or ipad that iPad iphone does not required itune to jailbreak so if you are on firmware that support for jailbreak you can jailbreak. code will inject directly into ipad or iphone device. Apple TV create a custom firmware rebuild firmware with jailbreak code in there to get cydia. so because of that it required itune to restore it again with a custom firmware to be able to success jailbreak…
So at this moments you are out of luck pretty much have to wait. My suggestion to you that use ifaith save all your blobs for now as whatever it available. who knows what will happen next let say if later a few months from new jailbreak team was able coming up with solution jailbreaking 5.2.1 and software release then apple patch it or kill it. and if you dont have blobs save previously you will be stuck again. so save it now while you can…