downgrade - Restoring older firmware through XCode? -

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I am trying to restore the 3GS to the iPhone OS 3.1.3 which has been upgraded to iOS 4. Reject the fulfillment of iTunes What needs to be done? I am currently using GM XCode, should I use the latest public stable version instead?

Update:

XCode reports that "baseband can not be recovered."

There are some answers.

BlackRa1n gets iPhone out of reboot loop after failed baseband rollback.


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