Hi...
Is there not an available Developer Disk Image for this situation? I am unable to do my professional job because I have not been able to overcome this issue on my machine. I have various things to try to resolve this issue so that I can install, run, and test apps onto my iPhone (iPhone 13).
The version of MacOSX is Sequoia 15.7.3.
I've tried everything from hard resetting the pairing stack, to resetting the trust on my iPhone. I've even sought help from AI. AI says, in a nutshell I'm screwed.
Apparently, I am unable to downgrade from iOS 26.2 to, say, iOS 18 or below.
I'll be honest: this is frustrating, and this situation seems to happen like clockwork with every update in either direction.
I hope someone somewhere has ideas. Thanks.
Update: I'm not even reaching the step where the shared Cache symbols are being copied from my iPhone.
The developer disk image could not be mounted on this device.
Domain: com.apple.dt.CoreDeviceError
Code: 12040
Failure Reason: Failed to find a DDI that can be used to enable DDI services on the device. Usually this means the best DDI we could find for a platform did not have compatible CoreDevice content. Run 'devicectl list preferredDDI' from the command line to get more details on why no valid DDI can be found.
User Info: {
DVTErrorCreationDateKey = "2026-01-14 18:56:43 +0000";
DeviceIdentifier = "C471EDF8-4385-5669-BA17-976B325B2EC4";
"com.apple.dt.DVTCoreDevice.operationName" = enablePersonalizedDDI;
}
--
Failed to find a DDI that can be used to enable DDI services on the device. Usually this means the best DDI we could find for a platform did not have compatible CoreDevice content. Run 'devicectl list preferredDDI' from the command line to get more details on why no valid DDI can be found.
Domain: com.apple.dt.CoreDeviceError
Code: 12001
--
System Information
macOS Version 15.7.3 (Build 24G419)
Xcode 26.2 (24553) (Build 17C52)
Timestamp: 2026-01-14T10:56:43-08:00
COMMAND LINE Developer % devicectl list preferredDDI
Host CoreDevice version: 506.6
WARNING: No usable DDI found for the iOS platform (The DDI's CoreDevice content is too old.). Best (unusable) DDI found is:
• hostDDI: file:///Library/Developer/DeveloperDiskImages/iOS_DDI/
▿ ddiMetadata:
• buildUpdate: 17C5038g
• contentIsCompatible: false
• coreDeviceVersionChecksIncludeDevelopmentRevision: true
• developmentRevision: 0
• enforcingCoreDeviceVersionChecks: true
• platform: iOS
▿ projectMetadata:
• Citrine-1500.1
• CoreDevice-506.5
• DTDeveloperDiskImageSupport-14.0.0
• DTOCMock-23002
• GPUToolsDevice_DDI-312.4
• JetsamProperties-2648.0.21
• LiveExecutionResultsLogger-20100
• Mercury-67
• Playgrounds-11
• XCTest-24507
• incompatibleContentReason: The DDI's CoreDevice content is too old.
• isUsable: false
• variant: external
WARNING: No DDI was found for the macOS platform.
No usable DDI found for the tvOS platform (The DDI's CoreDevice content is too old.). Best (unusable) DDI found is:
• hostDDI: file:///Library/Developer/DeveloperDiskImages/tvOS_DDI/
▿ ddiMetadata:
• buildUpdate: 17C5038g
• contentIsCompatible: false
• coreDeviceVersionChecksIncludeDevelopmentRevision: true
• developmentRevision: 0
• enforcingCoreDeviceVersionChecks: true
• platform: tvOS
▿ projectMetadata:
• Citrine-1500.1
• CoreDevice-506.5
• DTDeveloperDiskImageSupport-14.0.0
• DTOCMock-23002
• GPUToolsDevice_DDI-312.4
• JetsamProperties-2648.0.21
• LiveExecutionResultsLogger-20100
• Mercury-67
• Playgrounds-11
• XCTest-24507
• incompatibleContentReason: The DDI's CoreDevice content is too old.
• isUsable: false
• variant: external
WARNING: No usable DDI found for the watchOS platform (The DDI's CoreDevice content is too old.). Best (unusable) DDI found is:
• hostDDI: file:///Library/Developer/DeveloperDiskImages/watchOS_DDI/
▿ ddiMetadata:
• buildUpdate: 17C5038g
• contentIsCompatible: false
• coreDeviceVersionChecksIncludeDevelopmentRevision: true
• developmentRevision: 0
• enforcingCoreDeviceVersionChecks: true
• platform: watchOS
▿ projectMetadata:
• Citrine-1500.1
• CoreDevice-506.5
• DTDeveloperDiskImageSupport-14.0.0
• DTOCMock-23002
• GPUToolsDevice_DDI-312.4
• JetsamProperties-2648.0.21
• LiveExecutionResultsLogger-20100
• Mercury-67
• Playgrounds-11
• XCTest-24507
• incompatibleContentReason: The DDI's CoreDevice content is too old.
• isUsable: false
• variant: external
WARNING: No usable DDI found for the visionOS platform (The DDI's CoreDevice content is too old.). Best (unusable) DDI found is:
• hostDDI: file:///Library/Developer/DeveloperDiskImages/xrOS_DDI/
▿ ddiMetadata:
• buildUpdate: 17C5038g
• contentIsCompatible: false
• coreDeviceVersionChecksIncludeDevelopmentRevision: true
• developmentRevision: 0
• enforcingCoreDeviceVersionChecks: true
• platform: xrOS
▿ projectMetadata:
• Citrine-1500.1
• CoreDevice-506.5
• DTDeveloperDiskImageSupport-14.0.0
• DTOCMock-23002
• GPUToolsDevice_DDI-312.4
• JetsamProperties-2648.0.21
• LiveExecutionResultsLogger-20100
• Mercury-67
• Playgrounds-11
• XCTest-24507
• incompatibleContentReason: The DDI's CoreDevice content is too old.
• isUsable: false
• variant: external