There is a way to fix your wii however you have to hope that this is a semi-brick, allowing you to still access some funtionality. Plain black...
The Wii Licence changed a while back (Sysmenu 3.3 I believe correct me if im wrong please cos I really can't remember) allowing Nintendo to update...
I am not too sure about Wii64 and USB. Is it a hard drive you are booting from? Several USB problems can be solved by switching USB ports...
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