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I think the location to adjust brightness and contrast is in the same place as the x50 readers. While you have a book open, click the Options button at the right, select "Adjust View". You can try their default settings (which never did anything much better for me), or select "Custom" and adjust the brightness and contrast to whatever gives you a darker font.
Other than that, trying a different font would be the next step, along with brightness/contrast settings.
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