Using iOS App on iPhone 5s with iOS 12.5.8

Developer Tools & Services General
G. R. Akhtar OP
Created
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Objective: Downloading and running an old Swift iOS App on iPhone 5s with iOS 12.5.8.

Development System and Tools: Apple macBook, M4 Pro, running macOS Tahoe 26.3.1 (25D2128). Xcode Version 26.3 (17C529)

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DTS Engineer OP
Apple

Per the Xcode 26.3 Release Notes, Xcode 26.3 supports on-device debugging in iOS 15 and later. iOS 12 is no longer supported target for running your app with the debugger attached.