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If you didn't jailbreak your phone and install Cydia before you updated to iOS 6 then no.
I did have my iPhone 4 jailbroken on 5.1.1, but in the process of erasing all my content to get ready to sell it I upgraded it to iOS 6. How do I downgrade? I tried for hours this morning and couldn't get it to work.
I tried stitching the SHSH blobs onto a copy of the 5.1.1 ipsw file, then using redsnow to boot into pwned DFU mode, but it still wouldn't accept the new/old firmware file.
Did you add the couple of lines to your hosts file to point to Cydia's servers rather than Apple's? Haven't tried downgrading from iOS 6 but that's what you used to have to do.
And why do you care if you're selling it anyway?
Unfortunately once the 5.1.1 window closes, redsn0w’s 5.x downgrade feature will no longer work. Most A5+ users will not be able to downgrade. So if you’re an A5+ owner up at 6.0 when the 5.1.1 window closes, you’ll be stuck there without a jailbreak for now.
If you have a 4S and it was on 5.1.1 and jb w/ saved SHSH's you can reinstall 5.1.1 whenever you want. Once you upgrade to 6, you're stuck there permanently no matter what you have saved.
http://blog.iphone-dev.org/post/31869383801/blob-o-riffic
Did you add the couple of lines to your hosts file to point to Cydia's servers rather than Apple's? Haven't tried downgrading from iOS 6 but that's what you used to have to do.
yup. This is likely the problem. Either that, or it's stuck in restore mode. you can kick it out of restore mode with redsn0w (or tiny umbrella) AFAIK
Right, but he's on a 4S which means that he can't downgrade no matter what server he points to.
So if I buy a new iPhone 4S with iOS 6 preinstalled, I'm screwed?
he was replying to the guy with the iPhone 4 that couldn't downgrade his firmware, not the OP
Whats wrong with iOS 6?
Still wondering about this...Whats wrong with iOS 6?
Whats wrong with iOS 6?
Cant be Jailbroken yet (at least not publicly available)
For some people this is a major issue, inability to add a "quick menu" that lets you turn on/off verious radios, no tethering, less customication, etc.
Personally my concern is with Tethering - unless I JB I cant use an app like MyFi to tether (though I might have found a solution with tether.com but nobody here or on hofo has ever used it apparently...)
Also there's a distinct chance that some apps, specifically "in house" apps for certain businesses, hospitals, law offices, etc, may not work with iOS6 (though apple seems to have tried to minimize this, it's always a risk)