we have all noticed in many years that there are no problems with saving with any skin, even on car radio navigation.
Consequently, it can only be due to the device - or a file (SYS.txt?) that settings/changes are not saved.
If the configuration on Samsung is absolutely identical, no data is swapped out in the primary folder, then this save folder should also work identically on the car radio, so just copy and paste it.
Ultimately, a save folder only contains the configuration files from iGO (including the skin) itself - that's my experience