I have made a mini sys board for V6x,but I use the STM32H743IIT6 instead the STM32H753IIK6.Then I use the DFU flash the Bootloader，and use QGC update the Firmware.It seem good work,but after update the firmware,the led flash work good,but can’t connect to the QGC.Anyone Know?
What does the serial debug port output?