I think a similar kind of software and ebook format change has been made for Kindle for Android. A few days ago I installed the Kindle app on my phone and downloaded a book (enhanced typesetting enabled) and started reading.
Then the next day I went to open the book on the phone when I was not connected to the internet. When I opened the Kindle for Android app I got a new Terms and Conditions acknowledge title screen (after an update?), and when I went to open the book I got an error message say 'Book format not supported' and to download the book again.
The Kindle for Android version I now have is 7.7.0.123.
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