It's hidden because there are numerous ways to cause your aircraft to crash if you were to change anything. You can always downgrade the firmware if needed. As @WTFDproject has said, the firmware should be a match on the controller and aircraft. That will avoid any surprises. If you prefer, you can downgrade the autopilot and the camera to match the controller.How do I access he "secret menu"? I have to know what I'm giving up.