May I step in?
The method (very well) described by jack is only working with epub's. And will for these also work with porkupans (boroda) modified firmware. There you can also point userStyle.css to the new fonts.
But this fonts are only accessible for epubs!
The thing our asian colleagues are doing, is to remount one or all of the "system-fonts" so the can use the extended UFT-8 characterset of this fonts with the UI.
This fonts will also be used in the BBeB/LRF and RTF/TxT-viewer.
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