title: This iPhone 6 is running iOS 12.3.1 (16F203), which may not be supported by this version of Xcode
body: <p>Xcode updated to the latest version 10.2 recently and so did the iOS to 12.3.1. My Mac is an older mac that's working on High Sierra and I cannot update to Mojave. I have Xcode 10.1. How do I add the supporting files and where can I find them? Any help would be appriciated. Thank you</p>
  
  <p>I have tried copying the files from a folder with 12.2 and restarting Xcode but to no luck</p>