I use Aldiko Basic on an old Android 6.x because Lithium isn't available.
I use Lithium on all my later Androids and up to 10.x
I use Xodo for PDFs, though it can do ebooks.
I use KoReader on an Android eInk (Android 8.x) downloaded using the browser on it as an APK from Git direct and then installed, no PC needed.
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