How to unlock secret engineering mode menu in RNS-E Navigation Plus (Audi A3 A4 A6 R8 TT Exeo)

Enter hidden menu (engineering mode) and find few awesome features in your RNS-E (Navigation Plus) system in Audi A3, A4, A6, R8, TT, Seat Exeo, Lamborghini Gallardo. Take screenshots to SD card, watch current speed in km/h and MPH, check FM tuner details, activate hidden features! More at http://mr-fix.info/audi-rns-e-hidden-...