I have the Pioneer avic 5100NEX. I messed with my back up camera settings and now even in Drive my camera stays on or I get the black screen that says "Caution images may appear reversed..." I know I need to change the settings back, but I cannot get into them because the screen won't allow me to press any buttons. I have tried the reset button. I keep reading about pressing and holding mute, but I do not have a mute button. My mute is on my touch screen. How can I get the back up camera off when I cant get to my settings?