To customize an Amazon Kindle Fire HDX 7, you need to install rooting software before downloading software not available to your device. Once you unroot your Amazon Kindle, you can access the Google Play Store and other app sources. The unrooting process reverts the operating system that Amazon designed back to its Android foundation. While rooting mobile devices allows much greater customization than by default, this process may also void warranties, expose security flaws and make updating difficult.
First, select Settings and then Applications to allow for the installation of software from unknown sources because the Amazon Appstore does not offer any rooting software. Then, download Towelroot, a popular root exploit for Android devices through your browser. Next, install the ES File Explorer file browser from the Amazon Appstore, which allows you to access the recently downloaded Towelroot and install it.
After opening ES File Explorer, select the Download folder native to your Kindle, and tap on the tr.apk file to install Towelroot. Once Towelroot is running, tap the Make It Ra1n icon to unroot the device, which should take just a few seconds. Root management apps such as SuperSU are recommended for users who unroot their devices because they prevent apps from accessing certain information without the user's knowledge.