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Is the book one you bought and downloaded direct from Kobo, or one you sideloaded? Have you tried a few different books?
The font colour defaults to black, but can also be set in the book itself. If the book has changed it to another colour then you would need to edit the book to fix it.
Some publishers change the font colour for headings, but I have never seen a book where the main text was set to anything except black, I would really count that as a publishing error.
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