I have a USA region Wii U on Firmware 5.5.1.
I have installed Haxchi 1.6 Channel, not the one that autoboots.
I have the Homebrew Channel installed.
I am using the Brazillian Method.
Use WUP installer to install games to external hard drive.
I use Wii U USB Helper (ver 0.6.1,146) and get games...