reformatted this post
https://gbatemp.net/threads/how-to-change-the-system-menu-region-for-your-wii.170971/
Getting started:
[*] Click here to download
[*]Click 'Save', when prompting to begin the download, to your Desktop.
[*]Extract the contents by using a program that use .ZIP.
[*]Click the extracted folder on your Desktop ('WiiRegionMod' folder)
[*]Insert your SD card on your computer.
[*]In your SD card directory, create the 'apps' folder on your SD card (without quotes) if you don't have one.
[*]Copy everything that's included in the WiiRegionMod folder to the apps folder on your SD card.
[*]Copy the 'wad' folder (without quotes) to the root of your SD card.
[*]Take out your SD card on your computer then put it on your Wii.On your Wii:
[*]Turn on your Wii.
[*]On the Wii Menu (system menu), navigate to The Homebrew Channel.
[*]To avoid an '-1017; error, while you're in The Homebrew Channel, go to WAD Manager.
[*]In WAD Manger, install IOS-36-64-v1042.wad first, then IOS-16-64-v257.wad and finally the cIOSfix.wad. After that, press the HOME button to return to The Homebrew Channel.
[*]Go to cIOS rev08. In cIOS rev08, choose 'Network Installation' (without quotes).
[*]It reboots to the system menu. On the Wii Menu (system menu), navigate to The Homebrew Channel.
[*]While you're in The Homebrew Channel, go to AnyRegionChanger.
[*]Change your console region and your system menu region to Japan, USA or Europe. (For example, console region must be Japan and your system menu region must be Japan.) excl.gif NOT MATCHING YOUR CONSOLE REGION AND YOUR SYSTEM MENU REGION WILL CAUSE A SEMI-BRICK FOR YOUR WII!! excl.gif
[*](Optional)Changing the game region allows you to launch USA game discs and channels (including Virtual Console and WiiWare) if you set to USA in AnyRegionChanger, and it won't brick your Wii. Change your game's region to USA, Europe or Japan. Otherwise leave it.
[*]Navigate to 'Go' (without quotes) then navigate 'Yes' (without quotes) using your Wii Remote while in AnyRegionChanger.
[*]Be patient while installing system menu 3.2.
[*]After finishing installing system menu 3.2, while you're in AnyRegionChanger, navigate to 'Exit to The Homebrew Channel' (without quotes) to return to The Homebrew Channel.
[*]Go to Wii Region Changer (application made by Waninkoko).
[*]Press the A button first, then change using the left or right directional pad (a.k.a Control Pad) to your system menu region (Europe, North America or Japan) (for example, 3.2J (Japanese system menu region) = Japan). Then press the A button to continue.
[*]Now it restarts. On the Wii Menu (system menu), click the Wii button (located on the bottom left), go to 'Wii Settings' (without quotes, located in the right), press the plus (+) button three times and go to Update. This will update your system menu from 3.2 to 4.1.
[*](Optional) If you want to change your Wii Shop Channel country code (ex. from American Wii Shopping Channel to Japanese Wii Shopping Channel), you'll have to remove your Wii Shop Account in Wii Shopping Channel. Before removing your Wii Shop Account, be sure to check and enter your serial number on your Wii, found below of your console (without vertical stand). Now go to The Homebrew Channel while in Wii Menu. In The Homebrew Channel, go to WAD Manger to install IOS-36-64-v1042.wad first, then IOS-16-64-v257.wad and finally the cIOSfix.wad (this will avoid the '-1017' error. Then press the HOME button to return to The Homebrew Channel. Now go to AnyRegionChanger, change your Wii Shop country code. Before that, here's a list of country codes: