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I've had the same problem with iOS 14.4 (18D5030e) The remote device connection terminated with an error. Domain: com.apple.dtdevicekit Code: 802 Failure Reason: The device finished with the error code -402653083 ("Could not connect to the device."). Recovery Suggestion: Please check your connection to your device. User Info: {   DVTDeviceErrorIsProxied = 1;   DVTRadarComponentKey = 487927; }- Could not connect to the device. Domain: com.apple.dt.MobileDeviceErrorDomain Code: -402653083 User Info: {   DVTRadarComponentKey = 261622;   MobileDeviceErrorCode = "(0xE8000065)";   "com.apple.dtdevicekit.stacktrace" = ( 0  DTDeviceKitBase           0x000000012f0aac8f DTDKCreateNSErrorFromAMDErrorCode + 220 1  DTDeviceKitBase           0x000000012f0c0f96 -[DTDKCopyValueRequest finishWithResult:andError:] + 490 2  DTDeviceKitBase           0x000000012f0bc67b _60-[DTDKRemoteDeviceConnection primitiveDrainPendingRequests]blockinvoke3 + 213 3  DVTFoundation            0x000000010ffa117e DVTCALLINGCLIENTBLOCK + 7 4  DVTFoundation            0x000000010ffa2da0 _DVTDispatchAsyncblockinvoke + 1191 5  libdispatch.dylib          0x00007fff201ed5dd dispatchcallblockandrelease + 12 6  libdispatch.dylib          0x00007fff201ee7c7 dispatchclientcallout + 8 7  libdispatch.dylib          0x00007fff201f1195 dispatchcontinuationpop + 423 8  libdispatch.dylib          0x00007fff201f0868 dispatchasyncredirectinvoke + 713 9  libdispatch.dylib          0x00007fff201fd857 dispatchrootqueuedrain + 326 10 libdispatch.dylib          0x00007fff201fdfb8 dispatchworkerthread2 + 92 11 libsystempthread.dylib       0x00007fff20396453 pthreadwqthread + 244 12 libsystempthread.dylib       0x00007fff20395467 startwqthread + 15 ); }- System Information macOS Version 11.2 (Build 20D5029f) Xcode 12.3 (17715) (Build 12C33) Timestamp: 2021-01-09T15:19:40Z

I now get this as well on start, then Photos quits:Error Domain=PHPhotosErrorDomain Code=5103 "PHPhotosErrorBookmarkResolutionFailed" UserInfo={NSURL=file:///Users/***/Pictures/Photos%20Library.photoslibrary/, NSLocalizedDescription=PHPhotosErrorBookmarkResolutionFailed, NSUnderlyingError=0x600002832dc0 {Error Domain=com.apple.photos.error Code=41014 "(null)" UserInfo={NSURL=file:///Users/***/Pictures/Photos%20Library.photoslibrary/}}}- Repairing the database doesn't work- mtime's suggestion above doesn't work as Photos only appears briefly in the list of storage options and then vanishesThe console shows errors like:photolibraryd: No SSB on file for <private>photolibraryd: Error creating bookmark data for URL <private> : Error Domain=NSCocoaErrorDomain Code=256 UserInfo={NSDebugDescription=<private>}Photos:Failed to open photo library <private>, Error Domain=com.apple.photos.error Code=41014 UserInfo={NSURL=<private>}Photos:XPC connection error to assetsd <private> : Error Domain=com.apple.photos.error Code=41014 UserInfo={NSURL=<private>}Photos: Creating blackhole proxy for <private> from proxy factory <private> for library URL: <private>Photos: error 19:00:29.646747+0100 Photos Swallowing proxy invocation: <private> <private>

Can you see the "Locations" section in the left sidebar of your Finder?

It should show up under "Locations"

If you look in the Finder now you'll see your iOS device listed there (I see my iPhone at least) and clicking it gives you a window with a lot of the tabs you used to see in iTunes. You can then Option-Click Check for Updates to browse for the iPSW file manually.I have iOS 12.4 beta on my iPhone X and this process fails when updating to iOS 13 beta but your mileage may vary. Good luck!