i think this helps
As you can see from the title, my wii has been semi-bricked for a couple of months now. I own a japanese wii and remembered updating from a NTSC-U SSBB game (I also did a 2nd update with a NTSC-U band hero game so its 3.4J now). I just installed bootmii as an ISO and HBC and tried using ARC to downgrade to 3.2J but that didnt work as well. I know i have a modchip in my wii but not sure what it is. -.- also tried booting the update disc with Gecko OS but it just gives me code dump error. The only way left is probably to update using a japanese game but now should i download a game that has a 3.3/3.4J or 4.1J? Any kind soul out there who wants to help me will be greatly appreciated!