Well, I just updated my Wii a couple minutes ago (literally) and this is how I did it.
1) Pick up the filechopped versions of 1.9s and 1.4 config disc(if you don't know how to filechop)
Filechopped files can be found here: http://forums.afterdawn.com/thread_view.cfm/597460
2) Burn both of them...