Can I update my Wii U to 5.5.1 instead of 5.5.2? I want the 5.5.1 because Haxchi seems to not work on my current version (5.3.2) so I can't modify my Brain Training, it always appears an error, "MCP hook could not be opened!" I've searched on other websites about the problem, and seems it could be fixed by updating to 5.5.1. Any help?