Question

Can you restart your file on dream radar, and if so, how?

Answer 1

You just have to delete the Dream Radar app from the 3DS and re-purchase it from the eShop.

Hope I helped. :)
Source

Comments

you mean re-download: you don't have to pay again, even if you reformat your 3ds: I know because I've done it due to my attempting to get everything in the friend safari

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Does this still work after the online services and eShop were shut down?