Firstly, you shouldn't format a Garmin device's internal memory unless you are having problems that cannot be overcome any other way. If formatting is needed as a last resort, bricking due to an unknown file for example, then only [Only registered and activated users can see links. ] is sure to work to Garmin's proprietary OS's satisfaction. Other tools might be fine, Windows built-in tool is hit and miss but never use a Mac to format a Garmin device as success rate is low.

If you do have to format the internal memory but the device still has Mass Storage Mode available then always take a backup beforehand. [Only registered and activated users can see links. ] if SD commands work too. Even the internal memory's region containing all files and folders can be copied to SD by a similar fashion: [Only registered and activated users can see links. ].

There may be other things missing which WebUpdater or GarminExpress might provide but they will never offer another basemap (gmapbmap.img). Any version of basemap will work mostly, however as you now have lots of space on the device you can use the latest and largest WW basemap: [Only registered and activated users can see links. ].