What Files supports my Garmin Device and which Files I should update?

SQLite folder is used in some automotive devices, mainly for traffic predictions and other specific on-road use.

SQL folder in outdoor devices is for ActiveRouting, a function for customized route suggestions optimized for leisure activities. Quote: "Now you can see with your Garmin the ideal route for walking, hiking or mountain biking". I believe this feature is only available in devices which can fully use Garmin's Topo Pro maps.

Quoting from another forum:

• SQLite - Folder stores .db files : Traffic trends, ecoRoute,myTrends and some user's strings.('quick_search_list.db' and 'recent_searches.db' for example:addresses, post codes). user_strings.db (Destinations entered.) RecentStops.db (Recent stops made by the user, last parking spot) To read these files you can use a SQLite client .
  
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  Deleting the 'quick_search_list.db' file will clear the Quick Search items from POI category searches
  Deleting the 'recent_searches.db' file will delete the pre-populated items from the Instasearch bar

• SQL - Folder contains SQL/DB-file "Trail Database" for outdoor devices activities.
  It displays special routes or information depending on the activity chosen by the user, differentiating between pedestrian activity cycling activity, hiking etc : Active Routing feature in new Garmin Topo maps PRO.

More info about SQL use here in DE:

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