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This is usually an issue with the Firmware, so I would first like you to do this please.
Remove the charger from the Kindle and hold the power button to off for 35 seconds.
Release, then connect the charger and try to turn on the Kindle and use it.
Let me know the results please
ok, when you say locked, you mean you cannot put in the passcode to unlock the screen?
Or it will not respond to anything you do?
When you did my instructions, did it turn off?
It is the internal memory that has faulted.
A corrupted firmware can cause this. But we have ruled this out by trying to hard restart it.
I am really sorry about this and you are going to have to return the Kindle to have it replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
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