Not sure if this is the correct form. (If I’m in the incorrect form please direct me to the correct one -Thanks)
This is the issue:
Yesterday I bought two books on Amazon published in September 2025 and the other August 2025; downloaded them to my Kindle (11th gen/ ver. 5.18.5.0.1). This is my first purchase with the new update (automatically updated/cannot locate a way to disable this function)
Calibre, version 8.12 / all plugins are up to date (Package KFX 2.26.2 / KFX input same)
DeDRM plugin (10.0.9)
Kindle serial number is set correctly in the plugin config.
Windows 11 (a friend is running Windows 10 and has this same issue, same gen Kindle/book pub. July 2025)
When ‘Add books to library’ in calibre the book appears as an KFX-ZIP even though when looking on the devise download file root it is listed as an KFX file.
When the book is ‘dragged and dropped’ it also appears as an KFX-ZIP in calibre.
I (we) do not understand why it appears as a KFX-ZIP file.
Do I (we) need different plugins?
Is my (our) plugin KFX outdated (although I (we) did the newest update when it became available)
Do I (we) need to find an older version to run on the Kindle? (if this is the case, please direct to where this may be located and how to install it – please & thanks)
I have seen calibre, version 8.5.0 mentioned but can only locate 8.12 (may be v.8.50 is for mac)
I know that the KFX-ZIP cannot be converted.
But tried it anyway and got
Cannot convert....
This book is locked by DRM.
How to stop Calibre from importing/displaying the book as an KFX-ZIP file?
Thanks
