Problems with two motor of flame wheels F550

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TopoRtkGuana

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Costa Rica

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I need help you with my F550.

I seems that all connections and setting are fine but when I try to star the flight, two ot the engines do not accelerate as with the others.
What cause the drone to crash against the ground.
I´m pretty new, so I do not know where to star.
Thank you very much fir what you can help me.

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2018-5-31

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