For those that are experiencing "CODE DUMP" issues even though they have followed the instructions to the letter..
Make sure you are using an SD card, not an SDHC card. I had the same issue and decided to try my 512mb SD (non-SDHC) card, worked like a charm... going to pick up a 2GB non-HC SD...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced