This iPhone 6 is running iOS 12.3.1 (16F203), which may not be supported by this version of Xcode

Question

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

I have tried copying the files from a folder with 12.2 and restarting Xcode but to no luck

Answer 1

So after many findings and following links, I have found a solution for anyone struggling out there. Steps as follows

1. Shut down Xcode.. I mean to quit it
2. Go to this link and download this file
3. create a folder named 12.3 (16F203) and copy the extracted two files... take note, this includes a "DeveloperDiskImage.dmg.signature" and "DeveloperDiskImage.dmg" (I found that these files eventually work fine as opposed to copying other files from previous folders... might be the dmg files)
4. run the following command on your terminal window... please note, adjust the file path according to your installation of Xcode. "ln -s /Users/damn_son/Library/Developer/Xcode/iOS DeviceSupport/12.3\ (16F203) /Users/damn_son/Library/Developer/Xcode/iOS\ \DeviceSupport\"
5. I found that step number 4 links the file as mentioned in this thread. it did the trick
6. re-start Xcode and try compiling and running again. good luck

Answer 2

FolderName is important, check spacing also

1.create file with name 12.3.1 (16F203)

2.copy the contents(from https://github.com/iGhibli/iOS-DeviceSupport/blob/master/DeviceSupport/12.2%20(16E226).zip)

3.paste the folder in the DeviceSupport folder /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/ and copy-paste the contents.

4.quit the xcode and relaunch.