if you want to set the customized overall system display font, you need to update the system version to V3.5.1. If you just want to change the reader's font, then there are no system version limitations. About the font formats, both TTF and OTF are supported. If you want to add the font to the device, simply create a folder called "font" (lower case only) and then throw the font files inside (the preferred size of the file is less than 15MB). for the detail steps of how to use the fonts on Tab, you could google it because it is a bit hard to describe by using words.
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