either your wii was modded in the old days or you came across an old school softmod guide. i suggest to use our softmod any wii guide, linked below, to make sure you have everything what makes a softmodded wii. bootmii/priiloader, a cIOS rev17 or higher. 002 error should not be hard to overcome, cIOS/loader updating should help (some loaders have an option to bypass 002errors).
you can also only update your cIOS, link below - cIOS as wads.