* install koreader 2023.10 from fdroid
* download Noto Sans Telugu from fonts.google
* created dir fonts in koreader
* copied and renamed NotoSansTelugu-Regular.ttf_
* Noto Sans Telugu.ttf
* Noto SansTelugu Regular.ttf
* setting added addotional fallback in device
* deleted docsetting & cache in koreader
* verified lang available in device settings_ yes
* open txt file, all telugu characters are
displayed as question marks
* external links_
https://en.wikipedia.org/wiki/Telugu_language