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Your Kindle is updated to new software. If you don't like the new interface, you can change it back to original home screen without cancelling that update. Tap the Menu button i.e the 3 dots (or bars) at the top right of screen. Tap Settings. This will bring Settings.
In Settings, tap Device Options. Tap Personalize your Kindle. Tap Advanced Options. You will see Homescreen View option with a switch on right. Turn it off. That should do it.
If you have any difficulty on following the steps above, please let me know