What is what, when i enter the software, there is main controller and P330CB, which one is the phantom? Is the main controller the remote controll? Also, if i downgrade to firmwire 1.8 do i have to downgrade everything else like remote controll and gimbal and all, or can i run everything at latest upgrade with phantom at 1.8? Also do i need to downgrade mobile app? If so how do i downgrade the app?