EMAX NightHawk Betaflight?

I really would like to try this BetaFlight on my
Emax Nighthawk pro 280

But I can’t
I can’t calibrate the motors
nothing happens at all

Everything is fine with cleanflight

Does The EMAX Nighthawk Need Its Esc’s Flashed For Betaflight 3.0 My Motors Spin Up After Saving Settings In Betaflight

Then I Have To Remove The Battery There Is No Start Up Tune When Using It Either

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Same problem here in 2019.