I just have downloaded Xcode 15 beta version, and upgrade my iPhone to iOS 17 (which I use for developer proposes). Everything works fine, but when I tried to switch back to Xcode 14.3 (coping iOS 17 Device Support files from Xcode 15), I found that there're missing.
I re-download Xcode 15, but the result was the same.
Anyone knows what's happening? Or Where should the files be?
iOS 17 beta requires Xcode 15 beta.
Copying files from a newer version of Xcode to an older version of Xcode for any purpose was never supported. That it worked for your needs was coincidental.
As the system evolves, any expectations for "how things work" could be made invalid, and this appears to be the case here.
Please use Xcode 15 beta to work with iOS 17 beta.
For earlier OS and Xcode releases, please refer to the Minimum requirements and supported SDKs for appropriate and supported combinations.
—Jason.