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Whenever you open a book, the reader creates a file named "style.css" in the epub subdirectory. When you change the font and then open the same book you had, it still uses the old style.css file. You have to force it to create a new style.css file, which will then change your font, by changing your css file to the font you want, open any other book, then re-open the book you were reading and the font will be changed.
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