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My VTOL will flip backwards when taking off

My VTOL will flip backwards when taking off. The motor is turned correctly and the sensor is calibrated multiple times.
This is my flight log. Can someone help me? thank you very much!

I think you forgot to attach a link to your flight log. Anyway, have you calibrated the accelerometers properly? By “sensor”, I think you mean the “accelerometers”? Have you calibrated the ESCs properly? Do the rear props turn before your UAV flips?

Servers by jDrones