Whether your Kindle device is old or new? You should always update their software version because when you update new version of software in your Kindle, your device work fast as compared to old version. When the update is available it automatically downloads and install on your Kindle but your device should be connected to wireless. If you face any type of glitch related software update in that case you can contact to Amazon Kindle Support Number
1-866-947-8499. The support and help team of Kindle is always prepared to help you at 24 * 7.