So I had this problem too, and then I saw a reddit page that said a guy's region was changed to Japan on a European 3DS. This happened to me too, and it has something to do with attempting to enter the system settings in HANS while selecting the Japanese region. This then sets your entire system to that region, and blocks you from services like the eshop, and miiverse. It's an easy fix, though: System Settings>Other Settings>Profile>Region Settings. Just wanted to clear things up.