Closing and Restarting Xcode solved it for me - and many others - see https://developer.apple.com/forums/thread/133759 .

That is a very strange idea...! Homebrew was installed AFTER the "xcode-select --install" command... And System Settings -> Software Update agreed that the Command Line Tools needed to be updated...!

Are you sure this is what you mean?: [quote='811766022, DTS Engineer, /thread/767515?answerId=811766022#811766022'] ensure that the iOS version on your iPhone is at least as old as the minimum iOS version supported by the Xcode version you're using [/quote] The lowest Minimum Deployment option on the General tab, under Targets, is iOS 15.6, and my iPhone just updated to 15.8.3. So what you are saying is that I need to downgrade iOS on the phone below iOS 15.6? That sounds strange.

After having followed the advice from DTS Engineer from Apple, including buying a new USB cable, my conclusion is that it is not possible to connect an iPhone 7 running iOS 15.8.3 to Xcode 16.1 on MacOS 15.0.1 Sequoia. This is quite unsatisfactory. For me, it puts Apple in a very bad light. I can add that I have used this iPhone 7 with earlier versions of Xcode (on earlier versions of MacOS) without problems! The fact that I pay more than 100 USD per year for the license to be an iOS app developer makes me even more unsatisfied. Now I have to buy another (newer) iPhone...

From the video "How To Add An App Icon In Xcode 14" - https://www.youtube.com/watch?v=OO8PM9PsE90 - and the comment that says use "CMD + Shift + O" to search for 'assets', I can conclude that in my Xcode project "assets catalog" is a weird Apple code for this folder: Project Navigator -> -> Resources -> Images -> AppIcon NOW I can add my single 1024x1024 icon image file, and let Xcode 16.1 create all the size versions it needs! PS: The answer from "DTS Engineer" just repeats the false claim that there exists an "assets catalog" called "Assets.xcassets". That folder still does not exist in my Xcode 16.1 project... But I solved the problem.

NOTE! It turns out that my Xcode 16.1 project is born with a Launch Screen Storyboard, where I could just insert my launch image! That solved it for me.