REAL FIX FOR 101-0502 : Since 2 days I can't play mk8 splatoon and use friend list To fix it you need to change your modem IP to do this search the brand of your modem and how to change it. If you can't change it for some reason you can use hotspot (other ip) You're welcome
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What do you mean with "change your modem ip"? Do I have to put the wiiu ip in the modem settings or what?
No you need to change your internet box ip and if you don't know how to do this search it for your box model