My name is***** am sorry to hear that you are having this issue.
I will be glad to assist you with this.
Follow these steps please>
Your Kindle Fire needs to be fully charged and connected to a Wi-Fi network before you can download the software update.
Tap the Quick Settings icon, and then tap Sync. The software update automatically downloads in the background, and installs after the download is complete and the device is asleep. Your Kindle Fire will restart during the software update.
Please reply and let me know if you need any other assistance,
Also, please take a moment to rate my service by choosing one of the stars at the top then click submit.
did that work for you?