To all those doing the "15% trick"..
Didn't somebody mention that this actually skips the update, while making it think it did it, and this would cause inability to later play the real legit game since it will not be ready to read DL disks?
Can anybody confirm or deny if this is true, by starting with a "15% trick"ed SSBB and then afterwards trying the legit copy if you have one that works? (I know it's a hard scenario but we really don't want that risk!)
This update does not make DL discs work. The Wii has always been compatible with DL discs since people with unmodded japanese Wii are already playing. And besides, this is Japan update 3.1J which is the equivalent to 3.1U, so there's no problem in skipping the double channels.