If you’ve updated your development phones to have the latest OS, 3.0.1, then you won’t be able to load you apps onto the device without first following this apple advisory
2. Copy and paste the following line into Terminal:
ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0\ \(7A341\) / Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0.1
But theres a catch, if you copy the text they have from the document into Terminal there is an extra space created before the second “Developer” path, remove that and all should be ok.
i.e. the command line should be…
ln -s /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0\ \(7A341\) /Developer/Platforms/iPhoneOS.platform/DeviceSupport/3.0.1
Tres Useful!