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I often use the Merge Epubs add on, in calibre, to make series anthologies out of the individual ebooks. I sometimes bother to select the cover image of the book in the series that I am reading, from inside the anthology, long press on the image then use the "tap diagonal corners" screenshot method. KOReader then offers to make it the screensaver image. This won't work for me as my current reader is an Android Onyx Boox Note 2, so I need to make the setting using the device software. (That is pretty easy though.)
Luck;
Ken
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