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What firmware is on your WiiKey? Have you flashed to the latest 1.9s for your region?
I don't know japanese, but I'm curious to know if you're seeing any white writing on that black screen, indicating an 001 unauthorized device detected error.
Try updating to the latest firmware, and see if that fixes the problem of allowing your Wii to read the discs, so that you can do the update from the disc.
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