I just wanted to share my experience with the 70% method in getting smash bros brawl working:
PROBLEM: 1. I already had 1.9g installed and the latest wii console update for U.S
2. I went ahead and installed the 1.9g update again, no unplugging and letting the update run through for the test past and real pass. After the real pass, I press the reset button and a homer simpson quote sounds off saying " you are all nuts"
3. After the reset reboots the wii. I put in the 1.9b disc and go through the test phase to 100%. I then go through the Real install but I unplug the power cord at 70% exactly.
4. I then plug in the cord and start the wii.
5. I put in the Smash Bros. Disc. It loads up.
6. I get to the screen that says "now loading..." with a spinning smash ball and it hangs. I try unplugging, restarting brawl, and I keep getting the same hanging screen over and over
SOLUTION: 1. Complete steps 1-5 above in the PROBLEM section...
2. I make sure the Brawl disc is already in the wii, unplug the wii , plug the power cord back in, press the ON button.
3. At the black screen where it says "Press A", DONT PRESS A. Instead press the reset button. Let it boot back up to the screen that says "Press A".
4. Press the reset button again...reset the wii a total of 10 times or more in a row. 5. On the final reset, you should be able to boot Smash Brawl, get pass the loading screen, and it will prompt you to create a save file and your golden! I confirmed I was able to play story mode just fine!
Thought this might help because I have been attempting to get this wiikey corruption method to work for 3 days now!!