Flash px4 into stm32f427

Hello, I have a white stm32f427 circuit board, I have bootloaded the fmu-v2 onto the board using st-link, but I don’t know how to load the firmware step. i am having a PL2303 to communicate with uart circuit board. Which uart port of the circuit should I be able to flash?


I have successfully bootloaded the board, however when I plug in the USB on the board, QGC does not recognize the board to flash the fw. Can someone help me

If I switch boot to 1, there is a stm32 bootloader device


uploaded px4-fmu-v2 to the board, I connected pl2303 to USRT6 pin PC6 PC7 pin but when connecting using mission planner and QGC, mavlink timeout