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  1. Shak3rr's Avatar
    i have a iphone 3gs with firmware 3.1.3 on it i was wondering if i could update it to os 4, but with windows?
    2010-05-12 05:18 PM
  2. MacDevil7334's Avatar
    You UDID must be registered with a developer's account first. Then you will need to use a Mac to restore to 4.0. If you try it on windows, the restore will fail.
    2010-05-12 07:35 PM
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