Hi Claude31 thanks for your reply. My problem is just being able to go back to version 12.4 of Xcode. But there seems to be something left that makes me compile apps like I have xcode 13. As you can see ( xcode 12.4 device support -> h t t p s ://ibb.co/HhnCKvP ) I must not be able to launch apps on devices with ios 15 but I can do it and that is a problem. In the /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/ I have iPhoneOS.sdk and iPhoneOS14.4.sdk. Where can be hidden the iPhoneOS15.0.sdk, if I find it maybe I'm closer to the solution.