Create a folder for the wuphax.elf in the SD:\wiiu\apps folder. In otherwords:
SD:\wiiu\apps\wuphax\wuphax.elf
The boot.elf from the Hackmii download goes in the root of the SD card.
So, we only need the boot.elf file in the SD? all the other files and foldes inside "hackmii_installer_v1.2" (after we extract the zip) are not needed for the process?