Hi guys, I recently purchased an Altis 1.6 2017 (pre face lift), the head unit screen remains black. When I start the car, a toyota logo appears alongwith a loading bar, after the loading is complete the screen goes black and the radio is switched on. The reverse cam works the first time after starting the car but doesn't work later. Is this a software problem that I can fix on my own or should I take it to a shop? Also do you guys recommend any good shop to get this done from Islamabad? Any help regarding this matter is highly appreciated. Thanks.