1. what version of dedrm did you install?
2. how are you adding the book? are you dragging and dropping it from windows explorer into Calibre or did you, in calibre, click on the device button to view the books on your kindle and right click on the book and tell it to add to library?
fwiw, I am able to add books from all 3 of my kindles (K5, Oasis 3, PW5).
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