Well if bootmii works there is always the last resort of the nand formatter tool.
I am experimenting a bit with that lately. Finally being able to compile it and when I have a wii that can be formatted I will try my new versions. Have a version for EUR and USA wii compiled and ready for testing Spits out a bit more messages to the screen before it starts
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Send me a PM if you have any questions regarding unbricking with infectus mod chip or post a message in here http://www.wiihacks.com/bricked-wii-...installed.html