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That is a 2nd Gen Kindle from 2009 and you will need to update to version 2.5.8 (from 2.5.6).To do this, follow these instructions. If you get stuck, I will be here.
While asleep, the software update will download and install automatically. Your device may restart multiple times during the update process.
You will get a final confirmation letter titled 03-2016 Successful Update on your device when the update is complete. You can find the letter on your device by viewing all items in your Kindle Library, and then sorting the items by Recent.Regards