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Go to my Github repo iOS 14.2 Device Support File and download 14.2.zip file directly and after unzip it
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And just copy and paste unzipped folder by path:
Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/
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Restart the Xcode
That’s all. You can build and go on your project.
If you need a visual solution, check out this answer: https://stackoverflow.com/a/64854525
Why we have done these steps?: Because Xcode 12.1 doesn’t include support for 14.2 so we implemented its device support files for 14.2.
https://developer.apple.com/documentation/xcode-release-notes/xcode-12_1-release-notes