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The ones that fail are the new encryption.

To remove that you need another add on and the serial from the kindle as key

Don’t have the name of it with me now sorry

If I remember correctly the process is described in the README of the DeDRM plugin that can be downloaded from GitHub: https://github.com/apprenticeharper/DeDRM_tools/blob/master/... (and I am talking about the README file inside the zip you download there).

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