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www.ihackintosh.com/2010/06/downgrade-iphone-3g-3gs-ios-4-gm-to-os-3-1-3/

Downgrade iPhone 3G 3GS iOS 4 GM to OS 3.1.3 | iPhone

iPhone OS 4 GM is available for developers and it’s already leaked in the wild. If you downloaded those GM builds and now you want to go back to OS 3.1.3 or
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