title: iOS 12 not supported by Xcode 9.4 : Could not locate device support files
body: <blockquote>
    <p>This iPhone 8 (Model A1863, A1905, A1906, A1907) is running iOS 12.0 (16A5308e), which may not be supported by this version of Xcode. (Version 9.4.1 (9F2000))</p>
  </blockquote>
  
  <ul>
  <li>can anyone help with iOS <strong>12.x device support files</strong> from Xcode 10 beta?</li>
  </ul>