Hello All
i am a professional photographer and was using drones for photography. i am setting up a new drone as suggested by friends (quad 1 Mtr drone) from scratch for carrying my cameras… i have got all the materials for building it from market. i am using pixhawk 4 and ardupilot as MPS. pl suggest the best and stable version of firmware to be loaded on pixhawk4 and which version of ardupilot application to be used, many have been telling that the latest version of ardu are unstable for px4.
@soma thanks for joining the PX4 forums 
It sounds like you are looking for answers regarding Ardupilot, the best place to find help is on their forums (see link below), I hope you find your answer, safe flying!