japanese code is already known.. see robinsod's post above.
you have to use his flashtool to extract the kv.bin.. I can't really tell you more, as the flashtool crashes when attempting to extract my kernel (maybe an extract-kv-only option would be a good idea, robinsod?)
Do you have the correct keys? Using bad/invalid keys might cause a crash (thought I'd fixed that though)
I now have the Olympus MAUSB hack working with my own code & I hope to get the info I need from infectus to integrate their device. Today I will add some filters to the extraction process