Remove NNID Account from Wii U

[BanjoKazooieFan]

Hi,
I did make the last thread about removing the parent control pin AND a locked NNID Account.
After removing the pin (Thanks to the usb / rasperry pie) I can finally use the WII u.
After calling nintendo to link my Account to the wiiu (my old one was on my old broken wii u) and removing the nnid from the seller, they only did the first. They said, that only the original account owner can remove the nnid from the wii u.
So here is my question:
I have two NNIDS on my Wii U, my own and the locked one.
Is it possible to remove the locked one ?
And if yes, how? Homebrew, Tiramisu and Aroma are already installed.

 

[Korozin]

You can generate a master code to get into the account, change the password and just delete the account. There should be a "Forgot Password" option, and it'll prompt you for the Parental PIN, and it'll take you through the process of recovery.

 

[godreborn]

You can sorta. You can remove it from being listed. It requires the persisid.dat folder. You'd have to look in those files. The password for it is hashed, but you can see the email used by the account with account.dat, which can be opened with notepad++. Maybe you could tell Nintendo you forgot your password, then give them the email.