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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