Will Resetting my Router, Bring back its original firmware

I have a Cisco Router with the Type Linksys E4200

I currently have DD-WRT Firmware installed on it, instead of the original firmware that came with the router.

If I do a reset to the router (via the red reset button on the back), will the original firmware comeback or will the DD-WRT Firmware stay?

Thanks in Advance, Bryan

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