Restoring older firmware through XCode?

Posted by Moshe on Stack Overflow See other posts from Stack Overflow or by Moshe
Published on 2010-06-14T02:56:23Z Indexed on 2010/06/14 3:02 UTC
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I'm trying to restore iPhone OS 3.1.3 to a 3GS that has been upgraded to iOS 4. iTunes refuses to complete the install. What needs to be done? I am currently using the GM XCode. Should I be using the latest public stable version instead?

Update:

XCode reports that "The baseband cannot be rolled back".

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