Note 1 Onboard VTX can only work when battery was plug And low power of vtx when disarmed was actived So the vtx is very lower nearly 0 power out when drone was not armed you can change power level value 2 Visit https app betaflight com and click select your device then choose can t find my USB device then connect comport and betaflight configurator 3 Due to firmware target is not available in current betaflight official you can download hex file from the belowing link Firmware download CRAZYG473 4 6 0 betaflight firmwareDefault factory dump file Dump file for CRAZYG473 Betaflight4 6 0Specification Brand HappymodelModel CrazyG473 V1 0 AIO 5 IN 1 Flight Controller ItemParameterFCMCU STM32G473CEU6Gyro ICM42688PBlackbox memory 16MBSensor VoltageCurrentBEC 5V Max 2AUART UART 1 UART 2 UART 3 For RX UART 4 For VTX BetaFlight OSD AT7456EESC 5A continuousRX Serial ELRS 2 4GHzRX antenna Enameled copper wire 31mm lengthReceiver firmware target HappyModel EP1 EP2 2 4GHz RXOPENVTX 5 8GHz 48 channels Max 400mWFC firmware target CRAZYBEEG473USB port SH1 0 4PinBattery connector A30Mounting hole size 25 5mm x 25 5mmWeight 83g without pigtail and vtx antennaESCPower input 1S OnlyCurrent 5A continuous 6A peakESC firmware V0 21 hex BluejayFirmware target A X 5 96KHzDigital signal protocol DShot300 DShot600VTX OPENVTX Firmware Support firmware upgrade by openvtx configuratorOutput power PIT 10 25 100 400Frequency 5 8GHz 48 channels with Raceb