[glowby]

I have specifically chosen covers for all of my books in my Calibre library. All my books are in the .AZW3 format. I have also used the "Quality Check" plugin to fix ASIN to all of my books, so that Goodreads integration works. However, sideloading the books into my Kindle (via "send to device" in Calibre) results in the covers of my books being overwritten by the Kindle, and it seems to be pulling covers from the Amazon server.

I have searched through many posts about this issue, and it seems to be known that the Kindle will always overwrite the cover set in Calibre to one from its own servers, if an ASIN is set.

I have found that when my Kindle is plugged in, and browsing to \System\thumbnails gives me all the thumbnails that the Kindle has forced downloaded over my own custom covers, in the format of: thumbnail_[ASIN]_EBOK_portrait.jpg

Saving my custom cover in that format (and changing the [ASIN] to the corresponding ASIN of the book's title), and rewriting the file in the thumbnail folder, and then ejecting my kindle seems to have worked, with my custom cover showing without being overwritten, and Goodreads Integration working fine with my books with ASINs.

The problem is that I have over 300 books in my library, and manually doing this process is unthinkable. Has anyone come up with a better workflow for this, or is there a way Calibre can save the book covers in that thumbnail format?