Here comes a similar problem: I made all key lost bmw e70 x5 with xhorse vvdi key tool plus. I read flash and eeprom from cas3+ by welding and saved it. After i start process akl without isn, add key (315mhz). Read immo status, and saw the key was already programmed. But first thing is remote don’t work, and car didn’t start. Only starter run. And I have errors in DDE by launch 2E3C and 4D2D. I read the problem can be wrong isn by dde and cas. I don’t read isn in DDE, i start process without isn as suggested to me key tool plus. Please any suggestions.
Solution:
Do a Synchronization CAS with DDE with Key tool plus, ISTA or your Launch X431 scanner.
Read the key info from CAS module, with the information unlock the key that you made. You can unlock it with the read info from the CAS. It’s a cas 3+ you will need the ISN when your key is unlocked rewrite it utilizing a different position in the CAS with the ISN. Do not skip that step once you are finished, do a DDE &CAS sync.
Go to Immo Programming->BMW->Select from system->CAS3/cas3+ immo system->Synchrinization function to sync CAS DME.
Do not read the ISN from the CAS module. It’s encrypted whatever you are seeing is incorrect you need to write the information retrieved from the DDE. Don’t write nothing back.
Whatever position you used to make the key without the ISN must be deleted prior to reprogramming the key after it has been unlocked.