Hi, if you manage to go in the recovery menu (GC controller in port 4 and all the directions of D-pad pressed togheter at startup) and you see 4.2USA in the bottom right corner... you may recovery from this brick.
I've already bought and installed a Wasabi DX... but it doesn't work with fw4.2
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So I've bought a drivekey chip, and I'm still waiting for it to be shipped...
If you can wait, as soon as I get it I will install and try to unbrick my dead wii (Korean wii with US firmware upgraded to 4.2USA without reading anything around!) and will post everything
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I should receive it on Thursday... if everything goes smooth!
Good luck and feel free to hit the thanks button if you feel like...