In order to hard reset a Amazon Kindle Voyage, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Amazon Kindle Voyage device will be brought back to the default configuration of a brand new device.
1. Turn on the tablet.
2. Starting from the Home screen, go to Settings, Reset Device and Yes.
3. Done.
*the deafult reset code is 111222777