All these people installing wads and IOS's/cIOS's with no idea or understanding with what they are doing at all. Most likely the cIOS 250 wad they found and are installing probably has an IOS57 base as it is the most common to be used for that slot but with people blindly installing things they do not understand, it is a wonder that there are not more bricks around (or maybe there is). And just for the original OP's information, Kirby does not need cIOS250. That statement makes no sense. It probably needs to be run with a cIOS with an IOS57 base.Who says Kirby needs cIOS 250?
BTW, giving cIOS information is NO use unless you also mention the BASE.