You only need it to wipe the partition layout or erase old user data. So kind of 'format c:'.
Or you want some of the default provided data like some pics, a video? and old, very old map data (of Ireland in that case).

If it is a used one I would just overwrite the emmc whith that. There is also one emmc.bin out in the wild (original from Nokia) without any map data and just some low amount of data. But it does not really matter, just delete map data later.

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after refresh I see aspergerguy has already given link to NOMAPS. That is the one to use...