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

    Joined:
    Jun 23, 2007
    #1
    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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