This is my first time using PX4.
I am using pixhack v3.
The instructions I use are:
Make px4fmu-v3_default upload
Will always pop up the message "If the board does not respond, unplug and re-plug the USB connector."
By the way, I compiled successfully with "make px4fmu-v3_default"
This problem has been bothering me for a long time, I hope to get a solution.