[Conversion Output] KFX Output

[skinnybirch]

I'm not able to convert the ePUB BasisBibel: Die Komfortable (scrambled file attached) to KFX in Calibre. No issues with other ePUB files. It times out after 15 minutes/at 67% in Kindle Previewer without an error message when both "Enable conversion timeout" and "Show full Kindle Previewer conversion logs" are checked in KFX Output. Calibre and all plugins are up to date.

Thank you for your help!

[HowlerX]

Originally Posted by jhowell

I had some time to test this and I can confirm that this is the case.

In order to get Assistive Reader to work with sideloaded books they must be created with CDETYPE=EBOK which mimics a book purchased or borrowed from Amazon. See the Usage section in the first post of this thread for instructions on how to do that when converting to KFX format.

Yes, I can confirm this now. I thought that was the case at first. So I tried both scenarios, EBOK and PDOC of the same novel. I believe my problem arose because I didn't delete the PDOC version properly, I just overwrote the PDOC kfx with the EBOK kfx and I couldn't get Assistive Reader working. Deleting and then uploading the EBOK kfx version fixes the problem. Thanks for all your efforts.
--Howler

[jhowell]

Originally Posted by skinnybirch

I'm not able to convert the ePUB BasisBibel: Die Komfortable (scrambled file attached) to KFX in Calibre. No issues with other ePUB files. It times out after 15 minutes/at 67% in Kindle Previewer without an error message when both "Enable conversion timeout" and "Show full Kindle Previewer conversion logs" are checked in KFX Output. Calibre and all plugins are up to date.

Disable the conversion timeout and try it again. Very large books like that one can take several hours to convert.

If that does not work you can break up the book into smaller pieces using the EpubSplit plugin and then convert each one individually.


Added: I was able to convert the scrambled EPUB to KFX on my PC. It took almost six hours to complete.

[PeterT]

Many bibles are problematic to calibre (and eReaders).

[skinnybirch]

Originally Posted by jhowell

Disable the conversion timeout and try it again. Very large books like that one can take several hours to convert.

[...]

Added: I was able to convert the scrambled EPUB to KFX on my PC. It took almost six hours to complete.

Oops, I had no idea a conversion could take that long! I set it to run overnight, and the log showed a runtime of 6 hours and 45 minutes. Thank you so much.

[jhowell]

Version 2.18.0 - 12 Oct 2025

Detect Kindle Previewer versions up to 3.98.0.

Remove special handling for Hebrew (he) and Persian (fa) languages when Kindle Previewer version 3.98.0 or later is installed since those languages are now supported by Amazon. (Kindle firmware 5.18.5 or later is required for proper handling of the resulting books.)

[oldmoto]

my kindle colorsoft 5.18.5.0.1 can't dedrm ,is kfx-zip,how can I do

[jhowell]

Originally Posted by oldmoto

my kindle colorsoft 5.18.5.0.1 can't dedrm ,is kfx-zip,how can I do

You currently cannot remove DRM from a book downloaded to a non-Scribe Kindle running firmware 5.18.5 or later. For other options see the thread Dealing with Kindle ebooks in calibre.

[JSWolf]

Originally Posted by oldmoto

my kindle colorsoft 5.18.5.0.1 can't dedrm ,is kfx-zip,how can I do

And even if you jailbreak, it's possible you cannot rollback to an older firmware.