Get into and change iPhone Source Code without jailbreak?

How to you get into the iPhone's source code and change it without jailbreaking?

You can't.

All the software is compiled - there's no source code on your device.

You can pull the binary and run it through a decompiler… Get a rough approximation of the original code in assembly language… But that's it. You can't decompile it back to the original source.

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