please help!

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    BetaFPV Cetus(please help!)

    Hello, I just purchased a BetaFPV Cetus(brushed) and I have been flying it for a while now and I put in a new battery. It was the original one. Then the back motor was not thrusting or speeding up. It arms but when I press up on the left stick the drone just flips upside down on the ground...
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