Use a different SD card or wipe the contents from the SD you are using. Wad must go to root. Use network installation method if you have trouble. if you still have 2011/1017 errors then you need to TBR.
You do not need to revert your Wii to anything for goodness sake. Why are people so quick to take the high risk of bricking by reverting their Wiis to virigin over a silly error like that? The Wii is not a PC.