im sorry, this is important. spread this to other forums if you can.
IF YOU HAVE HOMEBREW CHANNEL OR ANYTHING ADDED BY SD CARD, DO NOT INSTALL WII MENU 4.2! IT WILL BRICK YOUR WII. ALSO, IF YOU HAVE BOOTMII, IT DELETES THAT AND BRICKS, SO YOU CANT DO A NAND BACKUP!
brick=makes your wii not go to wii menu, similar to red ring of death, but originating in software.
nand backup=only thing that stops a bricking wii.
pros=no more hackers online
cons=if you had hbc and didnt hack -.-