Check your iOS Version from (Settings ? General ? About ? Software Version) and get the device support file from the link below:
https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport
Next, unzip the files and place them at the following location:
Applications ? Xcode ? right click ? Show Package Contents ? Contents ? Developer ? Platforms ? iPhoneOS.platform ? DeviceSupport
Restart Xcode