I would try again, specifying that you want to create 'Repair DMS (full)'
- Specify the same firmware version as on your working DMS
- Ensure the option 'Install non-hacked firmware' is checked
- Ensure the option 'Reflash box' is unchecked
Make sure once this is done that you put some music on the DMS using your favourite software (Don't forget to save/eject!)
Try the DMS in the car. If you are using a Kenwood stereo, you _may_ need to factory reset it to see the new DMS, or disconnect the Keg for a few minutes from the stereo and re-connect. For some reasons the Kegs don't like swapping between DMS' occasionally. Bizarre, but true.