From your computer: Visit Manage Your Content and Devices. Select Your Devices. Select your device or app and select Deregister in the Actions column. ...
From your device: From Home, tap the Menu icon, and then tap Settings. Tap Registration. In the Deregister Your Kindle dialog box, tap Deregister.
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Give a call to the kindle expert to get the solution (877-330-0887) Kindle Technical Support Registration 877 690 9305