Unfortunately almost all Japanese radios are set to conform to Japanese laws and are not modifiable to meet US US specifications.?
The Japanese "FCC" does not allow the radios modification and these can not be changed without major changing boards or major components.
This is why Icom will not work on a Japanese version of a radio nor warranty one here as parts may not be available and they were produced for that region.
Best to not buy an out of region radio for use in the US.
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