Reading BMW DME ISN code plays an important part in BMW all keys lost key programming.
If you want to do all key lost for BMW 3 Series 5 Series 7 Series X5 X6 GT535 Six-cylinder engine, must need ISN code to program the keys.
And here are some youtube video guide on how to use CGDI AT200 to read BMW DME ISN code
MSD85 ISN Code:
MSV90 ISN Code:
MSD87 DME ISN Code: