Have got US 2012 A7 with MMI 3g+ in Europe, Maps don't work due to North America disk is slot, but unfortunately Sim slot doesn't work, it works but mine European sim card is searching network all the time and gives no signal, I guess the issue is that Europe and US have different GSM frequencies?! Can i somehow convert US UMTS module to EU? Can i do it through VCDS or i have just to replace it to European module?