Hi all, and thanks for reading the post. I bought my Phantom 3 Pro in October and at that time, my dealer loaded all the current software available at that time. I have never changed the firmware until today. I followed all the directions and go a confirm that the change was successful. I also changed the DJI Go app and upgraded the RC. Here are the updates: App: 2.5.1 Phantom: 1.6.40 RC: 1.5.70 With the blades off the Phantom, I started the craft and accelerated the left stick. It worked as it is supposed to. Here is the kicker. When I move the left stick backward, the motors turn off. Understand I am only moving the left stick and not both sticks and I and not moving the stick to the right corner, just straight back as you would in a landing configuration. I called the dealer and we tried and tried to figure it out. I don't dare put the blades on this and try to fly for fear it would not land our just take off. So, if any of you or DJI rep sees this post, please provide a fix. Thanks in advance. my personal email is firstname.lastname@example.org. Phil H.