If you have a truck map activated on the card for that device, as long as you have the patch active with any navcore the device will recognize the map.

The patches are better to use them with their corresponding navcore, navcore 20 for MSTMS 20, etc ...
I don't know what the loss of sound is.

You have done the process:

  1. Uninstall the patch.
  2. Recovery from black screen, three touches on/off boton, connected to mdc.
  3. Install navcore 20 with TBS.
  4. Install the MSTMS 20 patch.
  5. Reboot device.