Open the news files in the calibre viewer. If they are correct then the files themselves are correct. In that case you have to find out how to get your SONY to display then with a greek font. I suspect the sony handles news files differently from other readers. One workaround is to set your output profile in calibre to something other than SONY (use generic 6 inch) and send thenews files to the device using save to disk rather than send to device (this will get the sony to treat them as regular files rather than periodicals).
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