Help please iOS 5 Beta 5

Oct 1, 2011
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I bought an iPhone 4 from a friend who installed Ios Beta 5 on it. It has been working for a bout a month now. All of a sudden it has locked up and says activation required. I've tried connecting to iTunes and basically reprogramming it but even this won't work. Apple says they can't do anything about it because technically it's not supposed to be on there. Can anyone help me please! My phone is basically a paperweight now