Our Wii also lost ALL skill levels for ALL of our Mii's. We found it out one day when we turned the Wii on, and found all skill levels at zero. We dont know how to reset that data, but maybe we did it by accident? Could it have something to do with the fact that my kids have about 50 Mii's entered in the system?

Click the shadow of a person with the + sign and choose a Mii from your Mii Plaza, you could only have up to eight Mii registered on wii Fit per Wii.

Wii fit asks this every few days at the start of the training, especially if your weight changes drastically. Try this:
Use your Mii but instead of weighting yourself, ask someone alse to do the BMI test for you. If the weight is dramatically different, Wii fit will ask you to change your goal.
Hope this helps.

unbricking the wii while having bootmii or pre-loader is easy u can do it by pressing the reset button immidietly after turning the wii on .. from the rescue menu u can load a new menu update and there u go u unbricked ure wii...(that works for opera & menu bricks).... but for low level and high level bricks u can use savemii dongle or save mii frii... ( hope u unbrick it ^^)

Discovered that whatever Mii you pick first has to be the one to open the advanced levels. It does save it under that person, but if the whole family is playing and you go back in and pick someone else first, then that person won't have the advanced levels until it is achieved.

We had the same problem. Removing the Mii from the Mii Channel kept a generic Mii character in Wii Fit so we still had a problem. After about 3 failed attempts at a password, Wii Fit will ask for a height verification. Start making guesses as to what the person's height is and eventually you will get access and from there you can get into their Profile in Wii Fit and delete them.

My guess is that she changed the character before putting it in mii parade. The same situation happened to me, however if you simply put them in mii parade without changing it should be fine. It does note too when you put someone into mii parade that it has the potential to lose data, so it seems unfixable as of yet.

Best of luck,
-Aaron C.

This process only deletes Miis so that you can add new ones,
up to a maximum of 8.

Nintendo provides no advance notice that there is a limit of 8 players.

1. Go to the Wii Fit screen displaying all of your current Miis.
2. Select the Mii you want to delete.
3. Keep hitting the A button to go through all the extraneous jazz-ma-tazz nintendo inflicts upon us
until you come to the calendar page with the options BODY TEST and TRAINING at the bottom.
On this page you will see USER SETTINGS in the upper right-hand corner.
4. Select the USER SETTINGS page (push the A button).
5. Select DELETE USER DATA (push the A button).
6. Select YES to confirm that you want to erase the data.

I found this process very counter-intuitive as it required me to select the Mii that I wanted to delete,
then act as if I were going to use this Mii, before giving me an option to manage the settings for that Mii.

The process for using a memory card to save Miis has been impossible so far.
I purchased a Wii memory card, but cannot figure out how to bring the data from the memory card
back into the Wii Fit game.

Please be a bit more detailed in the problem. The Wii Fit Balance Board is very sensitive to weight shifts. Ensure that you allow the board to calibrate properly. To do this, I would suggest the following steps:

1) Place balance board on a sturdy, flat, smooth surface. If you have average-shag carpet, be sure to use the little adapters that fit over the feet. If the carpet is too thick, then it will NOT work properly. You may want to consider a small piece of plywood or something similar to set between the carpet and Balance Board.

2) Don't step onto the board until it has calibrated (this is when the board establishes its zero point). It will clearly say "Starting Up" followed by "Ok, Step On." After this, you can generally stay on the board unless a particular routine asks you to get off or for some reason it needs to recalibrate.

3) Finally, you must ALWAYS back out all the way to the Wii Fit Plaza (where you pick your Mii) if you change players. Once the board is configured for one player, it will only be suitable for that individual. Its sensitivity is based on an individuals weight. For instance, if the board is calibrated for a 3-year old's Mii, and an adult decides to play any of the routines on that Mii, the board will be over sensitive (calibrated for the lighter weight). Conversely, if an sdult's Mii is selected and a child plays a routine, the board may not detect the movement.

I hope these steps will help. If not, please offer a step by step explanation on what you are doing and I will try to reassess your situation.

Thanks!

well it makes sence u should have waited okay u should go to your mii chanel and cheak can u help me with my wii problem

I found this [temporary] solution at http://www.wiierror.com/wii-black-screen.php:

(via email, thanks Steven) This happened to me once, but I fixed it. Here is how:
Eject the disk
Unplug the wii at the back
Wait 1 minute
Plug it back in
Turn it on from the remote
Press reset if it does not show up
Hold the power button to shut it off
Turn it on once more.
I don't know how, but it seemed to work for me. The problem happened when I was trying to load the Mii channel. Hope this helps !

(via email, thanks Andrew)
The first time I shut down my Wii, the light went orange (as it should). When I turned on the power with my wii remote the next day, the wii\'s light turned green but the screen was black.
The treatment was the same as from Black Screen, No Connection: Unplug the Wii\'s power supply unit, then replug; turn system on with wii remote.
The difference is: this problem can strike in more places than just by loading the Mii Channel. Also, I think the green light being on (yet there being a black screen) is a common symptom as well.