4.1 has region free disc loading via modchip or dip patch
4.1 has bannerbomb v1
4.1 has bannerbomb v2
4.1 has wilbrand
4.1 has disc exploits, in any region since you can region free via modchip or dip.
Anyways, this OP's issue was addressed in post #2. Nothing more needed to be done.
Personally I have 4.1 because I can. I have had 1.0 and prelaunch, but they just don't work as well as 4.1. There is no difference between 4.1 and 4.2/4.3, only anti hack by N, and since both 4.2 and 4.3 update have intentionally and unintentionally bricked may wii's, I will hate it forever. But that is just me.
Also you are rather confused on your facts, region changed Korean wii's can run any system menu they like, in any region they like, prelaunch-4.3 without issue, assuming you follow good advice.