Using Action Replay disc, SD Card Adapater and a SD Card you can boot homebrew software like emulators and games on your Nintendo Wii without the need to open up the console and install a modchip.
You need
-Action Replay
-SD Card Adapter (Official or SD Gekko)
-Compatible SD Card
-SDLoad (Attached)
-A card Reader
Howto
First you will want to prepare the SD Card to be able to boot from your Action Replay disc. So insert it into your computer's SD Card reader and then format it as FAT16. To do this right click on the drive letter assigned to the card and pick format. Select FAT (not FAT32) as FAT under Windows is FAT16.
Unrar the attached file to a folder on your computer and then use the Command Line Interface to go to that directory. Next go to Start -> Run and type cmd.
Using the cd.. and cd commands, go to folder you extracted the file.
Type "sdpatch.exe (drive letter)"
ex. sdpatch.exe d:
Now you need to copy the "sdloader.bin" file from the directory you extracted the file in the root of theSD Card. After this you can fill the card with various homebrew games, applications and emulators.
After preparing your SD Card insert it into your SD Card reader and plug into memory card slot A. Next pop in your Action Replay Card into slot B and the Action Replay disc into the Wii.
When the Action Replay boots up pick the USA flag and then ADD NEW GAME. SDLoad is the game name and push done. Then enter (m) as the code name. Enter the following code:
7YPR-RKZZ-MH6W5
D26A-PE4J-1XX2W
ZJHY-B1ZH-6P00G
Then select ADD NEW CODE and name it SDLoad and enter the following code.
AF4H-JPF5-H1B5J
MVAB-7TQE-ABZPB
V2CK-QQ1A-Y6P72
M5N6-CMMH-9EURT
0JFM-3A6C-VZ6VK
KYV8-0JGV-0GR1N
2EGU-HVKF-NDMCN
7AH0-J9JZ-HHGNJ
4MHU-G8XT-ZRYCJ
9474-KF41-8KG34
QMEV-G90N-A8RV0
KD4G-5QHV-74D46
V97K-652Q-Y4TEY
6M4W-9GPT-E99NG
QPFY-DJAF-E01FV
2Z6E-P2WY-24WV4
6NHW-G3NH-HP31Y
A2KF-MCKN-D645J
K5V8-EF9W-7GFQC
XTU3-269T-VH5NE
H9GP-C4PP-6FGF9
HF77-R45C-ZXPDV
22Y3-D98C-50AJM
WTWZ-EC88-U5ZTV
36G1-UGDG-J2G84
DUMT-15KR-DXJ8K
JV55-6VF5-2Z02T
D4R8-MVJ5-QGR21
1G3C-APD7-1CUVD
Now select the code named SDLoad and check the box next to it, press Start and open and close the lid of disc drive when prompted. Then SDLoad starts up and you can now select which homebrew game you wish to boot.