I had a text file that had the em-dash throughout. The author liked ending sentences with it. Calibre would output an epub that corrupted it to a black box or other random character, whether in PC based ereader or my Jetbook.
Experimenting with assorted Calibre filters did not repair this, so here is what I did.
I loaded the epub in Sigil. Then I highlighted the first em-dash and copied to clipboard. I called up the search and replace menu, which had the highlighted character in the search field. Then I went to Windows character map and selected an em-dash from there, copied to clipboard and pasted it in the "replace with" field.
I selected to "replace all" in all html files, and a few seconds later it was done. The saved file rendered the em-dashes properly in all my ereaders.
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