Note that, as far as I am aware, use of Rockbox in and of itself will not improve readability. But the use of a different display screen/theme could, and Rockbox has many to choose from in the themes gallery.
Note that, as far as I am aware, use of Rockbox in and of itself will not improve readability. But the use of a different display screen/theme could, and Rockbox has many to choose from in the themes gallery.