Follow the semi brick guide you have already seen, you can use bannerbomb to load dop-mii (like the guide says) and reinstall system menu 4.1 for the correct region (i assume either USA/NTSC or PAL)
this will give you the menu back in english and should make games work again.
DO NOT UPDATE TO 4.2 EVER
Its likely your Wii is a region change korean unit and will brick it.
If after installing 4.1U you still cant get into settings, then just run any region changer and make sure everything is set to NTSC/USA