I just bought a Wii U directly from Nintendo, but I cannot enter it

So I recently bought a Wii U, but there is an account - assumingly used to test - on it, with a Parental Controls PIN assigned to the Wii U. It also had a disc inside.

I can't reset it, as there are preinstalled games.

I don't know if there are any ways to get past the PIN, or reset the PIN, so that is my question. How do I get past the Parental Controls PIN - or remove the PIN - on a Wii U?

Any advice is appreciated, apart from calling Nintendo. We've tried, and they aren't helping whatsoever...

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