Happened to mine, cure was to pin protect the kindle then enter the stunningly hard to find secret password "resetmyknindle" which forces a factory rest.
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201175110
Happened to mine, cure was to pin protect the kindle then enter the stunningly hard to find secret password "resetmyknindle" which forces a factory rest.
https://www.amazon.co.uk/gp/help/customer/display.html?nodeId=201175110