I updated Xcode 26.2, but now I cannot download the iOS 26.2 simulator. I updated Xcode to 26.4, but I still cannot download any iOS 26.x simulators. This is blocking my development work. I also updated the system, but the issue persists. Could you please help resolve this? Below is the error message returned during the download:
Download is not allowed as mobileassetd was starting up. (Asset download for com.apple.MobileAsset.iOSSimulatorRuntime c6f07ed8ec1586ca140801a2c7c60f478e947602) Domain: DVTDownloadsUtilitiesErrorDomain Code: -1 User Info: { DVTErrorCreationDateKey = "2026-06-10 02:45:19 +0000"; DetailedAssetAttributes = "Failed downloading asset with attributes ({\n Architectures = (\n arm64\n );\n ArchiveDecryptionKey = "FbRCdONFJWiVIFzMOmCDKgb1FCZYjCLgKMAk2/+SvTs=";\n ArchiveID = "fRcpbiW2lPoDn8jTQT3MfKG0DN/SGYVBOvK508mFg6A=";\n AssetFormat = AppleArchive;\n AssetType = "com.apple.MobileAsset.iOSSimulatorRuntime";\n Build = 23D8133;\n Ramp = 0;\n SimulatorVersion = "26.3.1";\n TrainName = LuckDHW;\n "_CompressionAlgorithm" = AppleArchive;\n "_DownloadSize" = 8388608000;\n "_Measurement" = {length = 20, bytes = 0x629c926e81dd5c64b364f36a554f47de42ee9ec1};\n "_Measurement-SHA256" = {length = 32, bytes = 0x86e78341 b58928cb e0320f9c 2b78de17 ... 3a547d62 b4867c98 };\n "_MeasurementAlgorithm" = "SHA-1";\n "_UnarchivedSize" = 8393543680;\n "__AssetDefaultGarbageCollectionBehavior" = NeverCollected;\n "__BaseURL" = "https://updates.cdn-apple.com/MobileAssets2026/mobileassets/094-25902/403F75CC-319D-4BCB-A0A4-3803C77A516A/";\n "__CanUseLocalCacheServer" = 1;\n "__RelativePath" = "com_apple_MobileAsset_iOSSimulatorRuntime/4FB4F415-F8E7-4321-BD7F-F61049663053.aar";\n})"; }
Download is not allowed as mobileassetd was starting up. (Asset download for com.apple.MobileAsset.iOSSimulatorRuntime c6f07ed8ec1586ca140801a2c7c60f478e947602) Domain: DVTDownloadsUtilitiesErrorDomain Code: -1 User Info: { DetailedAssetAttributes = "Failed downloading asset with attributes ({\n Architectures = (\n arm64\n );\n ArchiveDecryptionKey = "FbRCdONFJWiVIFzMOmCDKgb1FCZYjCLgKMAk2/+SvTs=";\n ArchiveID = "fRcpbiW2lPoDn8jTQT3MfKG0DN/SGYVBOvK508mFg6A=";\n AssetFormat = AppleArchive;\n AssetType = "com.apple.MobileAsset.iOSSimulatorRuntime";\n Build = 23D8133;\n Ramp = 0;\n SimulatorVersion = "26.3.1";\n TrainName = LuckDHW;\n "_CompressionAlgorithm" = AppleArchive;\n "_DownloadSize" = 8388608000;\n "_Measurement" = {length = 20, bytes = 0x629c926e81dd5c64b364f36a554f47de42ee9ec1};\n "_Measurement-SHA256" = {length = 32, bytes = 0x86e78341 b58928cb e0320f9c 2b78de17 ... 3a547d62 b4867c98 };\n "_MeasurementAlgorithm" = "SHA-1";\n "_UnarchivedSize" = 8393543680;\n "__AssetDefaultGarbageCollectionBehavior" = NeverCollected;\n "__BaseURL" = "https://updates.cdn-apple.com/MobileAssets2026/mobileassets/094-25902/403F75CC-319D-4BCB-A0A4-3803C77A516A/";\n "__CanUseLocalCacheServer" = 1;\n "__RelativePath" = "com_apple_MobileAsset_iOSSimulatorRuntime/4FB4F415-F8E7-4321-BD7F-F61049663053.aar";\n})"; }
Download is not allowed as mobileassetd was starting up. (Asset download for com.apple.MobileAsset.iOSSimulatorRuntime c6f07ed8ec1586ca140801a2c7c60f478e947602) Domain: com.apple.MobileAssetError.Download Code: 13 User Info: { retryWithBackoff = 1; }
System Information
macOS Version 26.5.1 (Build 25F80) Xcode 26.2 (24553) (Build 17C52) Timestamp: 2026-06-10T10:45:19+08:00