There is no guarantee that using homebrew software will not harm your Wii.does not take any responsibility for any problems arising out of installing homebrew. It is also possible that installing homebrew could void your warranty.
You can create an sd image of your current sd card with win32diskimager (if you're on windows) Note: images created this way can only be written to a micro SD card of the EXACT same size or bigger.If you're lucky, the only problem is a dirty lens.If cleaning the lens doesn't help, you can also try a system update.Note: Make sure you are using the right disk for your console.
Some people still don't realize that the Wii and the Wii U are different consoles.I like to use the microfiber cloths used to clean eyeglasses or; a tissue is second best. (When using a tissue, steam up the spot with your breath first.)Don't exert more force than necessary; it's a flimsy disk, not a kitchen sink.