Recently I've been getting the error: "Could not find Developer Disk Image"
I think this happens since I have updated iOS to 9.1 on the iPhone.
How can I fix the problem and make Xcode support iOS 9.1 devices?
1) I have experienced same issue, my Xcode version was 7.0.1, and I updated my iPhone to version 9.2, then upon using Xcode, my iPhone was shown in the section of unavailable device. Just like in image below:
2) But then I somehow managed to select my iPhone by clicking at
Product -> Destination -> Unavailable Device
3) But that didn't solved my problem, and it started showing:
Could not find Developer Disk Image
Solution) Then finally I downloaded latest version of Xcode version 7.2 from here and everything has worked fine for me.
Update: Whenever version of iPhone device is higher than version of Xcode, you may experience same issue, so you should update your Xcode version to remove this error.