If concern is having navigation, then you can buy small screen nav for 500 dhs with latest maps from sharaf DG. But if concern is to update the DIN nav system then it will be very difficult, may be try to go one day in abu shagara market in sharjah they have lot of car junkies and hacker type of guys who can do great stuff sometimes for less money. I know dealer repel non gcc specs cars as they didnt money on that car, so no help mate. Good luck keep us posted. Cheers.