It might be because you didn't do it right. try restarting it and then wait until it turns on then what you do is power it off then power it back on after that click the home button for 5 seconds without letting go of the home button click on the power button at the same time for 10 seconds then let both go at the same time it worked for me good luck
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It might be because you didn't do it right. try restarting it and then wait until it turns on then what you do is power it off then power it back on after that click the home button for 5 seconds without letting go of the home button click on the power button at the same time for 10 seconds then let both go at the same time it worked for me good luck