Many of my friends woke up to a rude shock when they found that their devices updated to iPhone OS 3.0.1 were not supported by iPhone SDK 3.1 Beta 3 for development.
If you too are experiencing the same problem, here is the solution to continue iPhone development with iPhone SDK 3.0 for your iPhone running iPhone OS 3.0.1.
1. Log-in to your MAC with an Admin account and launch the Terminal application (You will find it in /Applications/Utilities)
2. Copy and Paste the following line into the Terminal window
ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0\ \(7A341\) /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0.1
Note: If you have not installed iPhone SDK 3.0 in the default location “/Developer”, replace the “/Developer” directory in the above line as appropriate.
You can download the iPhone 3.0.1 Advisory guidelines document from iPhone Dev Portal
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