1. After Jailbreak iphone 4 with ios 5.0 semi-tethered jailbreak
2. Before upgrade to IOS5.0.1, need to use PKGBack the software before restore to factory setting IOS 5.0.1
3. Before upgrade to IOS5.0.1 need to restore to factory IOS 5.0 then upgrade to the IOS 5.0.1,
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