F4 stands for the flight control using the F405 main control chip, referred to as F4 flight control, while F7 stands for the flight control using the F722 main control chip, referred to as F7 flight control.

F4 stands for the flight control using the F405 main control chip, referred to as F4 flight control, while F7 stands for the flight control using the F722 main control chip, referred to as F7 flight control.

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