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
Apple released iOS 4.0, so as of today, Apple has stopped signing 3.1.3 restore files. That means that if you have a 3GS iPhone you cannot restore any firmware
www.ihackintosh.com/2010/06/downgrade-iphone-3gs-ios-4-0-to-3-1-3-with-cydia-shsh/
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Works with iPhone OS 3.o , 2.x [Last update 16 sep 2009] *iPhone OS 3.1 is now supported! 3.1 on iPhone 3GS not supported! You can find many ways for...
www.cazisoft.com/2008/installing-cracked-ipa-on-the-iphone-step-by-step-guide
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