A lot of iPhone 3G owners—myself included—have discovered that upgrading to iOS 4 has slowed their devices to a crawl. If you decide the new features and shortcuts just aren't worth the glacial performance, here's how to downgra...
www.lifehacker.com/5572003/how-to-downgrade-your-iphone-3g[s]-from-ios-4-to-ios-313
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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
www.ihackintosh.com/2010/06/downgrade-iphone-3g-3gs-ios-4-gm-to-os-3-1-3/
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