Did you know that the Walkera QR X350 Pro quadcopter actually uses a version of the arducopter firmware? That means that you can connect it to the mission planner to unlock all of the powerful features the arducopter firmware has to offer, like autonomous waypoint flights! I dont recommend upgrading to the latest arducopter firmware unless you know what you are doing. Otherwise its best to wait for walkera to release thier new firmware versions that have been configured specialy for the walkera X350 Pro flight controller.
Here is the video
And another tutorial on using the X350 Pro with the mission planner