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How to Downgrade from iOS4 to iPhone 3.1.3

As many of you already know today (21-June-2010) Apple released iOS4. It has some great features, however iOS4 has some compatibility issues with some programs that I require for work (e.g. Cisco VPN) and others. Here is the list of apps /extensions that do not even run/load, or causes instant safe mode: I tried for

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