I Modded my Wii U with Aroma a bit ago along with installing pretendo and I never unlinked my NNID, can someone give me help on how to unlink it from the modded Wii U?
This Nintendo Support article may help you in deleting/unlinking your NNID.
https://en-americas-support.nintendo.com/app/answers/detail/a_id/1088
You do NOT need to unlink your NNID to use Pretendo. You may experience side-effects such as your downloaded games disappearing.
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You cant actually unlink It as if you do It The user would be deleted too and your safe data games etc would be lost i suggest you adding your pnid to a new user moving The data with savemii to The pnid user and Then deleting The nnid user
Hope this helped!