The message the url to download the developer disk image could not be determined usually means the automation framework knows which iOS version your device is running, but it can’t figure out where to fetch the corresponding from Apple’s servers or a local mirror. Possible causes & fixes 1. Missing or outdated version mapping Check the tool’s internal mapping file (e.g., version.json in WebDriverAgent or iOSVersions.json in libimobiledevice). If your iOS version (e.g., 18.3.1) is too new, the mapping may not exist yet.

: Provide the image manually, or use a proxy/VPN to reach Apple’s CDN. 3. Xcode not installed or missing device support Xcode includes disk images for iOS versions it supports. If your Xcode is older than your device’s iOS, it won’t have that version.

: Manually download the disk image from a trusted source (e.g., IPSW.me Developer Disk Images or a GitHub repo like mspvirajput/DeveloperDiskImage ) and place it in the correct folder (e.g., ~/Library/Developer/Xcode/iOS DeviceSupport/ ). 2. No internet connection or blocked URL The tool may try to download from https://developer.apple.com/... but if you’re offline or behind a firewall, it fails.

It sounds like you’re encountering an error in a tool used for iOS testing (like XCTest, WebDriverAgent, Appium, or libimobiledevice).

Contact

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Tips

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