hello everyone,
i solved the problem by adding iOS 14.5 the device support file inside the Xcode app in path contents/Developer/platform/iPhoneOS.platform/DeviceSupport
You can download it from GitHub - https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport or you can download the new beta version and grab the directory from it.
MicheleC
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Thank you for the answer.
There is no error, the only problem is that Xcode not recognize my device that use the new beta version iOS 14.5
I know the solution (install new Xcode beta version on Big Sur), but I cannot install Xcode beta because I've got a MacBook Air 2012 not compatible with Big Sur.
My phone works properly, I installed the beta version because I need to test my app on it.
Do you know if there is other solution?