The map is not automatically reloaded. Unless you have it backed up or on your computer as a result of a previous download, it is gone!
The rest of the stuff.pretty much .Not any custom pois you may have downloaded.
May I ask......
Why do you want to wipe everything out?
If you want to reformat the internal drive, then first make a complete Explorer backup of your unit's contents. Ensure hidden files/folders are showing.
Now, you can reformat the unit and use Explorer to copy everything back.
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