How to factory reset a broken iPhone? (details bellow)?

I need to return my iPhone to factory settings. The problem is that my touch screen does not work, there's no picture showing, and I also have a passcode protecting my phone. Plugging it in and asking to reset it comes up with the "turn off find my iPhone" typical response and also my phone does not show up on Find My iPhone, so I can't just reset it.

If the touch screen doesn't work, the only other method that i can think of. Is plug it into your comp, let it sync with itunes. And from there, on the comp, you can do a factory reset

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