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Sorry for missing your post, been traveling outside for days.
What I want to do is to change the default cover for books that doesn't have a cover.(That is the 'alphabet picture'
I know calibre can do that. But all my books are sent to me as personal documents through ebook websites. In this way I cannot modify the cover(It's in Cloud Drive).
What I want is to change default background and remove 'personal' label by modifying system files. Just like what I do on Android (decompiling the apk(jar)). Thank you for your patience.
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