Crazybee F4 PRO Series flight controller Firmware
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 Betaflight Official will update firmware target from V3.5.5