Nuvi 57 adding CN Europe 2020.20 NTU maps ?

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Garmin Nuvi 5x serie are MTP Devices, you must enable "Mass Storage Mode" on Device to view \.System folder
To enable the "Mass Storage Mode", like the previous series, proceed as follows:

1. From the Map screen, touch the speed icon to access the Travel Panel.
2. Press and hold the Direction / Speed indicator for about 10 seconds until a hidden Diagnostics menu appears
3. Scroll to "MTP Settings", set to "Mass Storage" and Save settings.
   The Menu should appear like follow
   MTP SETTING
   MTP Auto Detect
   Mass Storage
   Mass Storage Single Session
4. Now your Nuvì is exactly like those of the old series (including .System folder)