sad said:
Um... yes it is, if you update from an import game you will probably brick your Wii as the game will try and install the different region firmware on your Wii.
This is how people not doing it properly bricked their Wii from Paper Mario, Mario Party 8, Big Brain Academy, just to name a few.
This is what I meant by not playing them properly.
Other than through the use of a chip the import games won't work anyway.