Good quality F4 board, has onboard flash etc. I don't recommend using the onboard BEC unless you're running 2S as it's a linear regulator. They tend to get very hot as they shed excess voltage as heat. I desoldered the linear regulator and put a micro BEC in place of it. The 6 pin JST connector pinout is GND, 5V, PWM1,PWM2,PWM3,PWM4. Only UART1 has inversion, it's labeled SBUS/PPM on the board. I put uninverted SmartPort on TX3 and it worked great.
F19848