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Quadcopter with pre-installed camera gimbal, 4K video camera, and wireless video transmission.

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Won’t get off the ground without flipping over

It starts looks ready to fly and as soon as it almost gets off the ground it flips onto its back and crashes . I have done all updates and reprogrammed it several times . I have built several drones but never had this happen . What do I look for and fix it?

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This appears to be very good video on the problem:

https://oscarliang.com/quad-flip-over-is...

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