[cclaypool16]

If the ISN is not matching it will not work. It is the parallel secret key that CAS uses to communicate with DME and EGS. It is not only the VIN to be the same, ISN also has to be. If BMW dealer gave you proper DME coded by your VIN number, it should work without issues.

The guy at the BMW dealer told me the new dme comes clean,and that the service dept uses special software to program,sync,and code all the proper info in the dme as this was what I was told by them before I bought it,I had all the working software to do this part myself but didn't inform them of this,so if I have ista/p then I should be able to do this myself,correct ? Can anyone with first hand knowledge that has done this please chime in,not saying anyone of your responses are wrong and I appreciate all your help this is such an awesome forum with so much knowledge you guys ROCK