Thread: Kindle Firmware 5.12.5
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Old 05-11-2020, 03:27 PM   #128
jhowell
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Join Date: Nov 2011
Location: Charlottesville, VA
Device: Kindles
Quote:
Originally Posted by JSWolf View Post
Given that Amazon has been making changed to KFX, I think this could cause an issue. Imagine you have a PW3 that cannot run 5.12.5 and it turns out that there i some change the KFX in 5.12.5 so these new KFX might not work properly on your PW3.
Amazon designed a solution to that into KFX. Each KFX-format book has a list of KFX "features" that it makes use of. Since KFX is always delivered directly to devices and cannot be downloaded manually, Amazon's servers are able to verify that the firmware running on the device supports all of the features that the book uses. If it doesn't then a fallback format is delivered instead, either KF8 or MOBI7.

There is a potential issue for those books that are only available in KFX format, such as Arabic language books. In the end, books that are only available on some devices and not others has been a thing at Amazon for a while now.
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