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You can reset the iphone 4 to factory defaults which will erase all previous user data and reset the phone to new condition
please follow the below steps
If your device doesn't go into recovery mode, try above steps again.
let me know if you face any difficulty
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It won`t power down.
Press and hold the “Sleep/Wake” button and “Home” button at the same time. Don’t release either button until you see the Apple logo appear on your screen about 10 seconds later, indicating a restart.