![]() ![]() ![]() There are very expensive interfaces that can edit the EWS or CAS to match the used DME, but this is besides the point. Some ECUs have the ISN in a OTP section (one time programming) of the memory (ex: MSD80 DME of the 335i), so essentially that ECU is married for life, you cannot edit anything to that ISN. This requires very intensive knowledge of electronics, and some expensive interfaces. There are aftermarket (non-BMW) software that help with ISN identification and maybe even modification, but this is done after reading a module’s EEPROM or flash memory. There is no BMW software that does anything with the ISN, besides the first time DME to EWS/CAS pairing (on virgin DME or virgin EWS) The EWS/CAS and DME/DDE stored ISN must match, or else the car will not start. Newer cars’ ISNs use a starting code that is stored in the DME (or DDE if a diesel car) and then change the code (rolling code) with each successful engine start. ISN is not a software, but rather it is the immobilizer key code that the EWS or CAS module (the immobilizer security module). Here is all about BMW ISN (DME DDE EWS CAS). ![]()
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