Just want to let you guys know that I just used the Wii Duplicated Channel Remover v2.1 by Waninkoko with the twilight hack and it works in 3.3U.
Created the thread because I have been looking for days googling and other forums about if was safe to do it in 3.3 but nothing appeared, so here it is proving that it works, also it fixed the error I had with the news channel when trying to load the news.
Hope this helps anyone
Lute