I now use KOReader exclusively on my Paperwhite so I no longer have to put up with having my ebooks deleted when connecting to WiFi. I wasn't trying to pull a fast one on Amazon by using Calibre. Most of my books were Amazon purchased AZW3 files. Downloaded and transferred via USB as permitted by Amazon. I used Calibre simply to make up for the deficiencies in Kindle firmware. To rectify the embarrassingly limited margin and line-height options built into the device. Now, very happy using KOReader on my Paperwhite and having options with my Kobo.
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