The coding string sets the configuration of the unit. NTG2.5 without other stuff can take 40mins, sometimes less - depends what release you are upgrading from.Īfter the update has done, the COMAND is SCN coded, and this will fail on cars that could not have had this option from factory as the MB computer can not generate the coding string since as far as it is concerned "this is impossible". The update updates anything on the MOST fibre optic audio network (i.e TV, DAB, Media Interface, Harmon Kardon, Sat radio, RSE) so that all control units related to to the audio system have compatible software - so can take a few hours. In the past it was simpler as markjay says. This is true for NTG2.5, NTG3, NTG3.5, NTG4, NTG4.5. The update involves logging in to Mercedes computers, so you need a SCN coding login too. The update has to be done with Star Diagnosis and the update firmware disk which is supplied only to genuine Star Diagnosis contract holders.
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