What version? Sounds outdated, DOP-Mii is the successor to DOP-IOS. Try that; also consider whether you followed a wiihacks softmod guide or not. If not... could be something ain't quite right. What purpose are you trying to use it for ?
When I try to launch DOP-IOS, it gives me a black screen. I've tried it with
-The Homebrew Channel
Any help? Are you supposed to use BootMii+cboot2?
PS - BTW, I am using a Wii 4.2U, if that helps.
Ipsa scientia potestas est.
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