you got cIOS249rev17 not rev20
so either get cIOS223 and/or a new 249 or both.
i would keep 249rev17 put rev20 in slot 250 and additionaly get 222 and 223.
see cIOS as wads link below
and: of course you have to get into action if you didn't install 222/223 before, you can check by just trying it when loading the game or doing a syscheck on your wii.