How to downgrade OS 3.1 to 3.0.1 (non jailbreak)

Discussion in 'iPhone' started by Dreamer2go, Nov 2, 2009.

  1. Dreamer2go macrumors 6502a

    Jun 23, 2007
    Dear all
    As titled, how are you suppose to do it?

    I searched online, and this forum, but seems it's for jailbreaking users?
    I want to get 3.0.1 back in order for me to use Microsoft Exchange for my firm.

    Thank you~

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