I did the following procedure for my NTSC-U Wii + 1.9g and ended up with a normal Wii, no duplicated channels.
0. Update Wii to latest version through online.
1. Patch the ISO with RegionFrii.
2. Burn the ISO at 2x with IMGBurn and verify turned on.
3. Patch the SAME ISO with Brickblocker (so now it's RegionFriied AND Brickblocked)
4. Burn the second ISO at 2x with IMGBurn and verify turned on.
5. Pop in the first burned disc.
6. Update to ~10-15%, pull the plug.
7. Pop in the second burned disc.
8. Works perfectly.
9. Throw away first disc, it's useless now.
NTSC-U with 1.9G Wiikey and 3.1U firmware.
Did exactly the same,
No duplicate channels game works fine, trying to figure out how to go to brawl mode














