FYI below from another thread. I don't understand where "internal flash" is to put the fonts, but this is very promising.
Quote:
Originally Posted by bigpizza
Un-rooted T1 now can use customized fonts. Got the method from a Chinese forum.
Put the customized font file in the location fonts/ in internal flash.
Add the font path in epub : res:///ebook/fonts/../../mnt/sdcard/fonts/font.ttf
Now it works to use the user's font.
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