Instructions
Turn on the Wii console and the television it is connected to.
Point the Wii Remote controller so that the onscreen hand-shaped cursor hovers over the "Wii" options button. The button is in the lower-right corner of the screen. Click the "A" button on the controller to select the options menu.
Click the "Setup" button on the screen that appears. This button has a wrench on it.
Look in the upper-right corner of the screen. The number indicates the firmware version installed on the console. After the number is a letter, either "U," "P" or "J." The letter represents the region code. "U" stands for United States NTSC; "P" stands for PAL (Asian region); and "J" stands for Japan NTSC.