Thread: Firmware update 5.12.4
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Old 02-20-2020, 10:20 AM   #36
ilovejedd
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Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9
Quote:
Originally Posted by Quoth View Post
can't see how it can be Amazon only, unless the FW is looking for clues in the KFX format of Whispernet, rather than Download via PC / USB of Amazon sales of Mobi and AZW3/KF8 depending on how old your Kindle is.
All Kindles that are getting the 5.12.4 update support KFX and AZW3/KF8.

The Kindle will only read embedded covers from MOBI PDOC.

The Kindle ignores embedded covers in ebooks with EBOK type and just downloads covers from the Amazon server based on ASIN. Calibre gets around this limitation by manually putting the cover thumbnails in the expected location: [USB]/system/thumbnails/

If cover screensavers are ASIN-based like the thumbnails are, depending on the implementation, it's possible that it would only work for Amazon purchased books or you'd need to embed the correct ASIN into the ebook if it was acquired from another source.
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