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only way to solve your problem is to restore your device.
just follow these steps
1.Attach the device to the pc 2.Turn the device off 3.Press and hold power. Keep holding power. As soon as you see display on the screen of any sort press and hold home button. 4.Hold power and home together for *exactly* 10 seconds 5.Release power but keep holding home until the pc beeps as a USB device is recognized. 6.At no point will the display come on. Now your restore should work.
now open itunes
if you do the steps correctly, itunes will stated that device is in recovery mode, asked if you want to restore, click "yes"
and let itunes restore your device
after finished restore
your device should be in working order again
give that a try
if it workout for you, please click accept. thank you