The MID has to be the same as the system that's installed. There is no anti-theft code...that went the way of the Dodo bird (radio changed at the e38/e39/e46 generation). Do you have the DSP amp already installed as well as the DSP coax cable? If not, the DSP MID is looking for that info to communicate with the amp and possibly the radio unit (which is incorporated into the indash CD player or Cassette player (not sure which one you have).

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