It'd say:
"This software cannot be used.
"The Nintendo Network ID used to purchase the software has been deleted."
[Next]
"You need to purchase this software from Nintendo eShop again to be able to use it.
Go to Nintendo eShop?"
[Cancel] Go
"This software can be deleted by going to Data Management under System Settings.
Go to the Data Management screen?"
[Cancel] Go

Source: I tried to boot an EUR game on a USA console without sigpatching.

 

lol because I said fudging?

 

That only happen if you try to run something like an injected VC game, the console won't freeze if you try to run something like Super Mario 64, it will just throw an error telling you the user which from the content was purchased of doesn't exist but it won't freeze.

 

Use Mocha CFW, it's better. And you only need to run sigpatches once, only if you reboot you have to do it again.

 

I agree with @Kafluke Read up on Haxchi, get that working and then you can consider upgrading to CBHC.

With CBHC your wii u will be cfw enabled from boot, you wont have to click anything, just run your games and they will work. Even the ones in the "DANGER" folder

Just make sure you reda up on it first and make sure you follow all the instructions.
Dont use an out of date guide either...... Just go to the official CBHC thread here on GBATemp

 

Same location as where the game/save is located.

 

There's one giant flaw with Haxchi though: You have to give money to Nintendo.
I'd rather just host the exploit on my phone/PC and skip paying an unneeded fare.

 

Because giving Nintendo 6 dollars is actually a sin. If you want permament CFW solution and ability to play non-legit games instantly for just $6.
Hell, looking at other consoles, it costs alot just to homebrew them.
[PS3 downgrading costs alot, here it just costs $6 and you already hacked your console]

 

god forbid if you pay nintendo for anything...
lol 6 bucks for automaticaly have sig patches on boot without having to constantly run a damn network exploit that requires another device every time you boot your wiiu for life.

with those 6 bucks you can isntall evrything and have acess to everything as soon as you wiiu boots without having to set up another device or internet connection.

 

I'm not giving 6 bucks or one cent to a company which devastates localizations, censors and treats their own fans like crap, sorry. I paid for early Vita exploits, but fuck giving Nintendo any money whatsoever.