Loly's logged off [as i'm about to do] but i reckon he's maybe referring to this method: [Only registered and activated users can see links. ]. My uncertain understanding is that this Merc system is different to Kenwood [they do both run Garmin software of course], i've heard that Merc is more like the later highly-protected Toyota for example. I hope i'm wrong and Loly's hint can help you guys with this.