Nope, just remove the owner's account, activate Pretendo Network with the plugin, and then login with your Pretendo Account.Will I have problems using Pretendo Network if I remove the old owner's account and create a new one?
Since I'm going to remove the old unlock, is there any problem updating the console? I saw that his vWii has "the homebrew channel". Would it be better to remove the old unlock, format it and only then update it, or just remove the old unlock, update with Aroma/Tiramisu and remove the old account?
I'm going to update soon, I just need to have some free time. Do you know if I'll be able to create new Miis and profiles on the console with Aroma/Tiramisu?
Sorry for all the questions, I was looking for information about this and didn't find much. Thanks for your help.
Afaik you can safely update your Wii U, just remove Haxchi first to make sure nothing wrong happens. I don't think it matters if you are formatting or simply updating, just don't format if you have Coldboot Haxchi or Aroma/Tiramisu, so if you want to format, do that before installing Aroma (and I recommend updating the system before installing it too).
You should be able to create new Miis and profiles, there was a bug with Tiramisu which made you unable to create profiles, but I think it's solved nowadays, but in case it doesn't work, just use Aroma, as it works 100% fine.