I have low power on take off. Won't take off

I have a 3dr iris plus. Last week I was flying around fine, now I don't have enough power to get of the grown. How can I fix this. Can I reset the controller to factory?

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I have this problem but only on two of the propellers. The "front" two accelerate fine but the "back" two only idle and will not get up to speed to take off.