i think wiimusic is a higher system menu, but not positive.
when i downgraded from 3.3U to 3.2U, then put in my original wiifit disc, it upgraded me to 3.3U. when i put in wiimusic, it upgraded me again, but stayed on 3.3U. i think wiifit puts you at 3.3Uv1... if you can get 3.3Uv2, you might...