The Problem:

Recently, after upgrading an iPhone to the current iPhone development firmware Xcode was unable to detect the device. I first noticed this when trying to build directly to the device:

“no provisioned iphone os device connected”. Needless to say, the device was in fact connected.

After that, I opened the organizer and saw:

“unable to locate a suitable developer disk image…”.

The Solution:

Downloading and installing the current Xcode SDK. Wouldn’t it be helpful if the error message could tell you that?