Thread: MOBI support for reflowable files ending on June 28, 2021
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Old 03-19-2021, 10:21 AM   #18
jhowell
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Location: Charlottesville, VA
Device: Kindles
Somewhat related to the topic of this thread is a change in the recent Kindle firmware release (5.13.5). This makes the "Publisher Font" option only available in books in KF8 (azw3) format when the book has the internal metadata field EXTH 528 (OverrideKindleFonts) set to "true". Books converted using kindlegen or the Kindle Previewer will have this metadata set and will work properly.

However books that were converted using calibre (and possibly other third party tools) lack this metadata and will no longer have Publisher Fonts available in devices using the new Kindle firmware.

This change will mostly affect those who sell Kindle books outside of Amazon's ecosystem and Kindle users who sideload books since they are more likely to make use of non-Amazon tools.

I am not sure whether this change was intentional or a bug. It might be an early indicator of Amazon's desire to reduce the creation of Kindle books outside of their control.
Last edited by jhowell; 03-19-2021 at 10:24 AM. Reason: typos
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