That's odd. Just installed Homebrew browser on vWii on my Wii U, and have installed absolutely nothing else, but am getting the "Kernel failed to load NAND" error.
Homebrew channel version is 1.1.2
IOS58 v25.32
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