Yeah, fake ones dont have the giant wii logo on the front
I came here to say this as well. One of the sites I used to use when I originally hacked my wii is wiibrew.org.
Something else to add to hacking your console is to get yourself a wii classic controller. It will make playing snes and most sega games a lot better than using the wii remote.
Ah, well this is a TIL moment for me. I've seen really mixed reviews on off-brand ones , and real ones for $30 or so.
From my knowledge, you cannot use the adapter with the WiiU when it is in Wii mode. Your only other option would be the Wii Classic Controller or Wii Classic Controller Pro