Hello David,
It might be possible to downgrade your device iOS version, but Apple has made this really difficult these days. And it does not worth the effort.
RE the message you see, I _think_ it is just a warning, and it can be ignored. So, you should still be able to detect your connected device via Xcode, and still be able to install a .app from your machine into your device.
However, if you want to get rid of the error/warning, here is what you should do:
0. Quit Xcode and disconnect your device
1. Download the device support files for iOS 16.4 from here:
https://github.com/filsv/iOSDeviceSuppo ... r/16.4.zip
2. Extract the .zip and place it into the appropriate place in your Xcode 14.2 app bundle, that is:
/path/to/Xcode14.2.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/
3. Reopen Xcode and reconnect your iOS 16.4.x device.
Hope this helps.
Kind regards,
Panos
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