iPhone 3G Downgrade From 4.0 to 3.1.2 on iPhone 3G

Discussion in 'iPhone' started by gadget69, Jul 5, 2010.

  1. gadget69

    gadget69 New Member

    Joined:
    Apr 16, 2009
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    Device:
    iPhone 3GS (Black)
    The battery life is poor with os4, and slow. I'm sure enabling multitasking is the culprit. I was thinking of downgrading to 3.1.2 on my 3G iphone. Is this possible? And what to use to jailbreak and unlock?
  2. ripply

    ripply Active Member

    Joined:
    Jul 31, 2009
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    Device:
    iPhone 4 (Black)
    Downgrade to 3.1.3 and jailbreak with redsn0w 0.9.4. To downgrade all you need to do is put the phone in DFU mode and in iTunes clic shift and restore and select the 3.1.3 FW

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