Thread: Dealing with Kindle ebooks in calibre
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Old 03-08-2026, 03:35 PM   #1352
lkmiller
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Device: Kobo Sage, Kobo Elipsa, Nook Glowlight 4 Plus, Kindle Oasis 2
Quote:
Originally Posted by hobnail View Post
I'm only getting kfx-zip books into calibre now. My kindle is a 9th gen Oasis, firmware version 5.16.2.1.1. I was transferring books from Amazon to my kindle right around midnight and the last book came in as kfx-zip when I transferred it to calibre, the other books are kfx.

I'm wondering if the last book that's stuck in kfx-zip land came in after midnight and there was a switch flipped somewhere. I tried deleting a book from calibre that I downloaded from amazon last week and downloaded it to my kindle and then transferred it to calibre and it's also kfx-zip now.

Is anyone else experiencing this? Any suggestions for fixing it?
I'm experiencing it too on a 9th gen Oasis, and I've seen a couple people also reporting this for 7th gen Paperwhites which are on the same firmware over at the GitHub. It doesn't appear to be the newer KFX DRM that Kindles on 5.18.5 and up or recent Kindle for PC are getting. However, new downloads of KFX format (regardless of the book's publishing date) are no longer working even with the correct serial number entered, only previous downloads. I'm guessing the same is true for any Kindle which receives KFX format -- previously unaffected 6th through 10th gen?

I assume that Kindles which do not handle kfx format remain usable the same as usual. I can confirm that's the case with my Kindle Touch testing a newly downloaded copy of a DRMed book (azw3/kf8). Curious what others are seeing.
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