Quote:
Originally Posted by hengyu
Followed these steps and for some reason, 2 of the books were added into Calibre fine, but one remained a .PRC in Calibre that says it's "DRM locked"
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Sounds like you may have failed to get the 4.16 version working correctly. Go back to your instance that is running 4.16, see if it imports fine and removes DRM, then and only then install 8.51 over it.