Things You'll Need
Instructions
Unbricking using a Nintendo video game
Buy or rent a new Wii video game that is made by Nintendo and intended for use in your region (i.e., country).
Turn on the Wii, insert the video game and let it load.
Wait as the firmware checker in the video game checks that the Wii's firmware needs to be updated. If this does not happen, it means no firmware checker is on the disc and another game will have to be obtained to try it again.
Follow the directions presented onscreen when the firmware checker has finished checking. The firmware will now be updated.
Eject the video game disc when the update is done and restart the Wii.
The Wii will now function normally--provided you do not make the same mistake again with a disc that is not of the region you are in.
Unbricking the Wii using a software file
Go to a website that offers a bricked disc fix for all regions and download the file stated as being for the USA.
Decompress the file and copy the ISO file to a recordable DVD using a burning program like Nero or Imgburn on a PC.
Turn on the Wii and insert the disc. Let the software do its work.
Eject the disc when it is done, turn off the Wii and turn it back on. The Wii should now function normally again.