My application targets iOS 15+. Attempting to build and run it on my iPhone SE (orphaned at iOS 15.6) results in "Failed to prepare the device for development."
I'm building with Xcode 15.2.
What is the expected procedure here?
How are you supposed to test on earlier iOS versions if Xcode is incompatible with them?
Xcode is not incompatible. I just built an app on iPad iOS 15.8 with Xcode 15.0.1 and target set as 14+.
Problem usually due to a version of iOS too recent compared to Xcode. Inverse to what you describe.
See this, could help: https://www.swiftdevjournal.com/dealing-with-failed-to-prepare-device-for-development-error-message-in-xcode/#:~:text=Why%20Are%20You%20Getting%20This,along%20with%20the%20iOS%20SDK.