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I had a stable tethered jb on iPhone 4 iOS 6.0. Downloaded My3G and started having serious wifi trouble.. restored my phone to re-jb and realized that I restored right when Apple had released 6.0.1 (within minutes!... f-me)

I have repeatedly tried restoring and re-jb ing my iPhone 4 on 6.0.1 even using .ipsw files of 6.0 with no luck. I am factory stuck. Made me order my upgrade to iPhone 5 earlier than I had planned..:(

Oh, well, at least I should have an iPhone 5 on 6.0.1 before the window is closed and iOS 6.1 presents even more obstacles to an untethered jb.
 
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