Hyundai I40 Double Din Headunit Installation

How to install a double din headunit into a 2013 Hyundai i40 I was asked to install this headunit, the owner was looking for a reversing camera and navigation in their car. A new headunit seemed the best solution to this as it was much tidier than reversing cameras that click on over the rear view mirror or need another screen. This is another Kenwood Headunit, a DMX5020DABS, so far i have been happy with the DMX8019DABS. The one fitted here has a capacitive touch screen but does lack wireless car play and android auto. Although both work through USB. The facia kit and wiring harness were bought from Dynamic sounds, as was the headunit itself and the camera. Everything installed quite easily.