Are you using latest Haxchi (2.5u2), latest CBHC (1.6), Mocha (0.2), or Mocha w/ FAT32WIP? Then nothing is needed, your Wii U is region free thanks to the CFW. Are you using loadiine? Nothing is needed, it's region free. Brazilian method? RegionHax
https://gbatemp.net/threads/regionhax-how-to-get-regionfree-on-wiiu.448468/
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Or literally any method aside from Brazilian method...