@duqiaochai-
Per NiLuJe's previous post, if you used kpvbooklet before (and not KUAL version) you will need to re-install kpvbooklet to get koreader to work (MKK is for Kual version).
I do not use koreader, so I am simply interpreting the previous posts, but that's how it reads to me. Good luck!
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