Newbie problem after a downgrade and original game

Ok, I'm a newbie... I downgraded from 3.4E to 3.2E... and now I want to play my original Mario Kart Wii, but it won't start. The Wii has to be upgraded before I can start the game.
Any workarounds?

/accurate

Strange... I really wanted to play Mario Kart Wii, so I decided to go for the update that my Wii proposed... and after the update, the version was still 3.2E and now I am able to play the game again.