Kakute H7 v2 ships with Betaflight Firmware.
Betaflight Target: KAKUTEH7V2 (BF 4.3.1 or Newer)
INAV Target: KAKUTEH7V2 (INAV 5.1 or newer), INAV VTX+ & Bluetooth Setup Information
Ardupilot Target: KakuteH7v2 (Ardupilot 4.3 or newer)
PX4: KakuteH7V2 (PX4 1.14 or newer)Firmware can be built using make holybro_kakuteh7v2
PX4 Bootloader HEX file for KakuteH7 v2:

115KB
holybro_kakuteh7v2_bootloader.hex