If you have an older system menu and you want to play a game that requires an update, or in my case always just to be on the safe side, run the game through Gecko OS, it loads only the part of the game that is needed to play and not the update and will prevent the update from installing. Gecko OS is stable and safe and does not touch your NAND in any way AFAIK. If it does it is not in a way that is going to damage your Wii. That is why I always run my games through Gecko OS, and not just to cheat either. Granted I am a little biased because I own the USB Gecko and I write codes for it but the app is great and is a safe way to run games on older system menus. If you have any questions about Gecko OS please feel free to ask me and I will do my best to help you out. BTW it will work with any game that has an update on it not just NSMB though that is a perfect example of its capabilities. I hope this shines a little more light on the value of Gecko OS. Talk to you later.
Sincerely,
Elmoreas