What I have to do is it seems once you install 13b it reappears every time you turn off (red light) the system and Id have to install rev 10 every reboot to get it to work. So if you install rev 10 and turn on wii connect 24 standby (yellow light) you can turn on and off and it works every time...
I have the same problem I have to install cios rev 10 every time I boot system to get it to work. Every time you boot system I suggest you do the same til we get an answer on how to fix.