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All my 3 kobo models on all Firmwares the sleep cover mode worked with all books. Perhaps it was do with the book format or how it was copied that it didn't work for you, or it was really old FW I've not seen.
I 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.
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