yo how do i transfer worlds from my old nintendo account to this account
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There should be an app for it on the homebrew store if i'm correct.
i think is using the savemii wu port
it says on the pretendo site to use savemii
On Wii U? Use savemii. Just make a backup from the old account and restore it to the new one.
WiiU Mapmanger X
Transfer With SaveMii