Amazon regularly updates its Kindle software with bug fixes, improvements, and even new features like book cover screensavers. Here's how to make sure you're always running the latest version of your Amazon Kindle.

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How to check what software your Kindle has
Your Kindle should download and update automatically when it's charging and connected to Wi-Fi. However, if you leave your Kindle in Airplane mode, haven't been connected to the internet for a while, or simply haven't charged it recently, your Kindle may not be using the latest software.
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To check which version of Kindle software your Kindle is currently running, go to the Kindle home page and tap the three small dots in the top right to open the menu.

Tap “Settings” in the Kindle menu.

Tap “Device Options” on the Settings screen.

Tap “Device Info” to see information about your Kindle’s hardware and firmware, which is the software it runs.

In the “Firmware Version” section, you will see the version your Kindle is running. In the screenshot below, you can see that mine is Kindle 5.13.5.

Once you know what software your Kindle has, it's time to compare it to the official release list. Visit Kindle Software Updates page . Find your Kindle version and compare your number to the latest version.

I have a Kindle Paperwhite (10th generation), so mine is updated to the latest version.
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How to update Kindle over Wi-Fi
If your Kindle doesn't have the latest software, you can update it. First, connect your Kindle to Wi-Fi and plug it in to charge.
On your Kindle's “Settings” screen, tap the three small dots.
If “Update Your Kindle” is black, tap it to update your Kindle. If it’s gray, it means your Kindle is up to date or there is no update available.

Information source: howtogeek.com
