Android E Ink automatic full screen refresh
 

I have an Onyx Boox Euclid, which runs on Android and has an E Ink screen. I have installed KOReader 2021.08 in it (mainly because I need MathJax rendering for EPUB). I noticed that KOReader never does a full refresh of the screen, resulting in substantial ghosting after I turn many pages. This forces me to do manual full screen refreshes. Is there a way to make KOReader automatically do a full screen refresh every 3 pages?

Look at the menu Settings (Gear) - Screen - E-ink settings - Full refresh rate.

Your device isn't flagged as eink because it is generic android and there's no api to detect and update the epd.

See https://github.com/koreader/koreader/issues/4551