The Url To ((better)) Download The Developer Disk Image Could Not Be Determined May 2026

“The URL to download the developer disk image could not be determined.” What it means: 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.

Here’s a useful explanation and fix for the error: “The URL to download the developer disk image