[tshering]

@xcuseme_1978
Do you see any of these many fonts listed, when you open the font settings? To access the font settings, you touch the bottom of the screen when a book is opened. Then you touch the symbol "Aa". In the dialogue field that will open, you can select from the available fonts ("Font Face"). Or did you already select one of your Hindi fonts and the book did nevertheless not show Hindi characters? I am asking just in case you did not see my question 1).
When you see some of the Hindi fonts in the list of the font settings, they should work, even if italics and bold will not be used because of the specific font naming requirements of the reading software. Therefore, if you see any of the the fonts in the list, and after selecting it, no Hindi characters show, we would have to think about how your epubs are coded.