Examples will be given for each on how to break down the full length ROM ID for N54/N55 cars to distinguish Hardware type, ROM Family, and the specific calibration ID.
0044CC0 - The first 7 digits are the hardware ID. They tell you what DME is in the car. (0044CC for MSD81, 0044DC for MSD80)
IJE0S - ROM family. Basically, the operating system (Windows 7 vs 8.1 vs 10, etc) for the DME/ECU. This is the main thing you need to look at for support questions.
IFA2S - Calibration ID. This is the actual tuning revision/changes for a ROM within a ROM family. We can easily add support for new Calibration IDs (less than 1 day normally).
Note: 2007 models had a MSD80 and start with 0044DC0, 2008+ N54s had an MSD81 and start 0044CC0
Note: Everything we can support (N55) will start with 0087980. The new DME (one we don't support) starts with 00879S0.