Environment Xcode 27.0 (Build 27A5194q) macOS 27.0 (Build 26A5353q), Apple Silicon Command Line Tools 27.0 Summary The iOS 27.0 (24A5355p) and watchOS 27.0 (24R5289n) Simulator runtimes download and mount successfully, but never register as usable. Both fail in exactly the same way. Every older runtime (e.g. iOS 26.2 / 23C54) works fine. What I see xcrun simctl list runtimes does NOT list iOS 27 or watchOS 27. They appear only under xcrun simctl runtime list (disk images), as: iOS 27.0 (24A5355p) State: Ready Image Kind: Patchable Cryptex Disk Image Signature State: Unknown Mount Path: /private/var/run/com.apple.security.cryptexd/mnt/... They never get promoted to /Library/Developer/CoreSimulator/Volumes/ the way working runtimes do. Where it actually breaks simdiskimaged finds and mounts the runtime with no error: "Found runtime bundle on disk image at: .../iOS 27.0.simruntime" "Got supported architectures back ... arm64" The runtime IS present in /Library/Developer/CoreSimulator/Images/images.plist, and its cryptex personalization manifest exists in /Library/Developer/CoreSimulator/Cryptex/Personalization/. BUT iOS 27 (24A5355p) and watchOS 27 (24R5289n) are the ONLY two images in the index whose signatureState is not verified. Every other runtime shows signatureState => verified. CoreSimulatorService therefore never registers them. So the cryptex mounts and the personalization ticket is present, but signature verification against that manifest never completes for these two new runtimes. Things I have already tried (no change) Deleted and re-downloaded the runtime via xcodebuild -downloadPlatform iOS (fresh image, identical result) Restarted CoreSimulatorService; ran sudo xcodebuild -runFirstLaunch Full reboot (cryptex re-mounts at boot but is still never verified/promoted) Deleted images.plist and let it rebuild Verified: system clock correct; gs.apple.com and ppq.apple.com reachable on 443; ~85 GB free disk; iphoneos27.0 SDK build (24A5355p) matches the downloaded runtime; simctl runtime match list shows 24A5355p as the chosen/default runtime. The standalone Simulator runtime .dmg for iOS 27 is not yet on Developer Downloads, so xcrun simctl runtime add isn't an option. Questions Is anyone else seeing iOS 27 / watchOS 27 runtimes stuck at Signature State: Unknown / signatureState != verified on this beta? Is there a way to force re-verification of an already-downloaded cryptex runtime without a standalone .dmg? Is this a known issue in the current beta? (FB filed.) Thanks!