Latest Amazon Kindle Fire Software Update Version 6.3 is available now. You should get the over-the-air (OTA) software update by now if you are still using stock Kindle Fire ROM. And lose root access again after this update. But no worry, you still can root Kindle Fire Software Update Version 6.3. What are the new features and enhancements from Kindle Fire Software Update 6.3? Amazon improves and adds several features like Sharing, Book Extras, Archive of Personal Documents, Print Replica Textbook, Reading View for Amazon Silk and Movie Rentals. Get more info at Amazon website here.
By the way，if you don’t want to auto update to latest Kindle Fire Software Update and lose root access, make sure that you already disable OTA with this guide – How to disable auto software update OTA on Kindle Fire?