Compatible with Crazybee F4 PRO V1.0 V2.0 V2.1
Crazybee F4FR PRO frsky version firmware target CrazybeeF4FR
betaflight_4.0.0_CRAZYBEEF4FR_20181211
Crazybee F4FS PRO flysky version firmware target CrazybeeF4FS
betaflight_4.0.0_CRAZYBEEF4FS_20181218
Crazybee F4DX PRO DSM2/X version and Crazybee F4 PRO No RX version firmware target CrazybeeF4DX
betaflight_4.0.0_CRAZYBEEF4DX_20181211
Please use Betaflight configurator 10.4.0 or 10.4.1 version to setup
https://github.com/betaflight/betaflight-configurator/releases/tag/10.4.0