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: http://modmyi.com/forums/general-iphone-chat/714270-soon-official-ios-4-0-compatibility-list.html
I tried for some hours and then I decided to downgrade back to iPhone OS 3.1.3 and upgrade when some of those apps are updated for iOS4.  After doing some research on the internet …