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If you are having difficulties with the Amazon Fire HDX 8.9" try referring to the Troubleshooting Page
Background and Identification
The Amazon Fire HDX 8.9 is a fourth generation of the Kindle Fire series. It was released on October 21st, 2014. The number 8.9 refers to the screen size of 8.9 inches. Older generations of the Fire include the 10 and the 8, each with their respective screen sizes.
This model is more than just a different size screen. This model of the Amazon Fire has nearly twice the Random Access Memory. This allows the device to run programs at a much faster rate. Additionally, it has a light sensor to assist in photography as well as a 3 more mega pixels than previous generation cameras. The screen of the Fire HDX 8.9 is 2560px x 1600px, allowing the user to experience 1080p HD resolution.
Amazon has separated the Fire from the Kindle family. The Fire series is now a unique group of tablets that is not considered a part of the "Kindle" family anymore.