You might want to read the top of THIS GUIDE about brick my wii
SD/USB Loader Error: Hardware not recognized. Most likely have a cIOS installed incorrectly, out of date, or missing. Possibly formatted the SD card or USB incorrectly, is unsupported, or not enough space.
Q. I have formatted the device correctly but I am still getting this error; how would i fix this?-1:
A. Be sure to have the device hooked up to the Wii before you power it on. You may lack USB support as well. Installing a newer cIOS 249 would clear this up.(cIOS249  d2x-v6
Wad Install Error:Most likely you have cIOS installed incorrectly, out of date, or missing.Your SD card is not Formatted as FAT16 or FAT32 properly, reformat it. If a file was needed, then it was not in the correct folder.Each application needs its files in specific folders, so pay attention to that. Can also be a bad wad or not enough space on the Wii. (example: If your installing cios38rev17 offline make sure you have ios38-64-v3867 on the root of your sd)