I googled your embedded font's name and it doesn't look like that is a font with Hindi glyphs. Does Hindi script display correctly in other books (without embedded fonts)? If not, or if you don't use any other Hindi books, I suggest you try downloading and installing some free Hindi fonts (.otf or .ttf; just copy them to your /koreader/fonts/ directory). (I suggest several because KOReader can sometimes be a bit picky about fonts and rejects some that don't meet certain technical criteria.)
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