Hi, thanks for using JustAnswer.com I am Cris.
The email you received was about updating your Kindle. You can update your Kindle at any time through the settings. The update is not required but recommended. Just so you know on the new update they have removed encryption making your Kindle more exposed. I would advise waiting until the newer update is released and you are notify in which they will put back encryption.
Let me know if you have any further questions selecting a positive rating is appreciated.
Hi, I wanted to check up and see if you have any further questions?