I have my Nova Air now for a few days and installed KoReader the first day i got it. KoReader works really great for epubs. all lightnovels i read are in epub, and they work great. so i would recommend koreader for epubs.
you can set up the e-ink refresh rate (default is i think 5:5, but you can customize it).
i tested Neoreader for reading, but didn't really liked it. for pdf its okay but for everything else i prefer koreader.
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