- Yes, it is safe to input the NNID confirmation code.
- The Wii U updates are designed to download and install automatically regardless of your settings. The Automatic Updates setting you're referring to has nothing to do with system updates. So, don't act indignant, because the only problem that happened was you didn't know what you were doing. Did you at least follow the directions I posted to make sure you don't accidentally update to 5.5.2 in the future?
I had changed my DNS settings right off the bat. That's what I don't get!