Any help on activating and using headless mode? Box says Syma, and "X5C-PLUS, designed by RX Aerio, upgraded by TurboTech". Unit is black, looks like std X5c, but with TurboTech props. Tx looks std, has the blue LED (which should indicate X5c-1). Manual is std Syma X5c. Left vertical trim button operates camera/video mode. Click left top button to change from low to high speed mode. Click and hold left top button gives five or six beeps, which I thought would initiate headless mode, but I get no change in the operation of the right joystick. Any help appreciated.