The update is available specifically for no-ad Kindle devices. It works on the 8th and 10th Gen Kindle, 7th and 10th Gen Kindle Paperwhite, and on 8th and 10th generation Oasis and 7th Gen Kindle Voyage e-readers. You can check to see if your Kindle is compatible here (opens in new tab). 

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You’ll be able to turn on or off the new feature in the Kindle’s settings menu, where you will find a “Show Cover” toggle for the new setting. This seems like a fun, cool feature but it also makes one wonder why hasn’t it always been available?  Lastly, do you really want everyone to know what trashy novel you’re currently reading? I don’t think anyone cares that I’m currently reading Voltaire’s Philosophical Dictionary and would probably think I am being a pretentious show-off. Then again, nobody ever needs to see that I am reading the very saucy The Lover by Marguerite Duras. So there you have it, turn the feature on at your own risk but if you do, pick a title that will garner the least judgment, like a puppy calendar or a cookbook. 

Amazon Kindle update turns your lock screen into a book cover - 64