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User 'dhewg' of the HackMii website has released a new version of the HackMii installer and The HomebrewChannel. Nintendo had previously fixed the loophole that allowed the Wii mod to be installed, but apparently not forever.
“we have a new release with a new version of The Homebrew Channel; this will install on both Wii consoles, and inside the virtual Wii sandbox inside the Wii U. The currently used IOS exploit is courtesy of tueidj. “
“Please note that this is not running in full Wii U mode; running this on a Wii U will probably work just like on a Wii. (See if you can find any differences, we can all try to hack the Wii U together from inside Wii mode!)
Also, due to technical limitations of the virtual Wii mode, BootMii will not work on a Wii U. If we are able to resolve this, we will make a new release with BootMii support.”
Update:
Unfortunately some bugs snuck into the v1.1 release, which are now fixed in v1.2:
-PAL 50Hz (576i) video mode now works properly
-BootMii/boot2 can be installed again on newer Wiis
-Icons load again in The Homebrew Channel
~ Source