Problem with px4 first run

Hi,
I bought a new px4 a few days ago and I wanted to connect it with Mission Planner but it’s not seeing device. Px4 is only flashing in orange colour.
Have you any solution to solve this issue?

If you are using MissionPlanner you would be using ArduPilot instead of PX4. In that case I would suggest to ask over at discuss.ardupilot.org.