在stackoverflow上找到了正确的答案
Xcode 12.4 “Unsupported OS version” after iPhone iOS update 14.7
概念就是下载真机调试包,然后放到/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/目录下即可
具体的调试包,可以在https://github.com/filsv/iPhoneOSDeviceSupport 找到
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