The Url To Download ((exclusive)) The Developer Disk Image Could Not Be Determined

Here is a comprehensive guide covering the causes, the official fix, and the trusted workarounds.

~/Library/Developer/Xcode/iOS DeviceSupport

You must have git installed and know how to use Terminal.

This is a very common and frustrating error for iOS developers, typically appearing in Xcode when trying to run an app on a physical device. It usually happens when your Mac tries to pair with an iPhone or iPad running a newer iOS version than the Xcode version supports. Here is a comprehensive guide covering the causes,

Starting with iOS 17, Apple changed how disk images are mounted, making many older automated download scripts obsolete.

“The URL to download the developer disk image could not be determined.”

This error typically appears when using a tool like libimobiledevice (or a wrapper like ideviceinstaller , pymobiledevice , or certain testing frameworks) to communicate with an iOS device. The tool tries to automatically fetch a Developer Disk Image (a .dmg file matching your iOS version) from a known online repository, but it either can’t find a matching version or the URL is malformed/unreachable. It usually happens when your Mac tries to

On macOS Monterey or older, you cannot install the latest Xcode 15+ needed to resolve disk images for iOS 17+.

Here’s a useful explanation and fix for the error:

The error message typically occurs when your version of Xcode or AltServer is too old to support the iOS version on your device . This is common for users on iOS 17 or higher who are trying to enable JIT (Just-In-Time) compilation for apps like AltStore or SideStore. Why This Happens The tool tries to automatically fetch a Developer

Create the folder if it doesn’t exist. Name them:

Apple releases iOS beta versions (and major public releases) before the corresponding Xcode version is officially out. When you update your iPhone to the latest iOS (e.g., iOS 17.2), but you are still running an older version of Xcode (e.g., Xcode 15.0), Xcode doesn't know how to communicate with the device.

In the very latest versions of Xcode, the file structure has changed to use "Simulator Runtimes." If the manual fix above didn't work, you might need to run a simctl command.