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Message: <blockquote data-quote="L0g1c5" data-source="post: 2219807" data-attributes="member: 759345">* If you have a Jailbroken iPhone 3G at 3.1.2 (but not  jailbroken with Spirit) then you should create the ipsw with PwnageTool 4.01 and restore from recovery mode or DFU mode.    * If you have an out of the box iPhone 3G you should restore using a PwnageTool 4.01 ipsw using DFU mode.    * If you have a Jailbroken 3.1.3 iPhone 3G it is very possible that this can fail from recovery mode, if this failure happens you will need to restore using DFU mode.    * As an alternative to PwnageTool, you can use redsn0w on iPhone 3G (on both Windows and Mac) as mentioned in our last post.taken from their site dev team</blockquote>