How do reset iPhone without erasing any other devices?

So I have two I phones, one that I use on a daily bases and another that has every on it that my regular phone does. For example if I delete a pic from the second iPhone, it will delete the pic from the first iPhone. I would like to reset the second iPhone WITHOUT deleting anything from the first iPhone! How can i Reset it and as if I just got it from the store, without resetting the first iPhone?

First take it out of iCloud. That's why changes are replicated across all devices.

Transfer it to iCloud and the get it again, it's the only option and you must install Leo Privacy Guard in it. This app is all you need, in terms of security.

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