The font names in your customized css info must be identical to the font filenames exactly. If there's any spaces in the font name, you must have quotes around the path. There was actually a font I used that wouldn't work without quotes at all, even though there were no spaces in the file name, so try it regardless.
If all that is correct and the font still isn't changing, some epubs have a specified font called for in their css file. Those will not change the font from a reader css file.
If you use Calibre, the way I check those epubs and change if necessary is to right click the book in question, select "Tweak ePub", then "Explode ePub". Open up the stylesheet.css file and see if there's a specific font family called for anywhere in the file. If there is, delete those referenced lines, save the file, rebuild the epub and upload it again to your reader and try it.
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