1: Open your device and disconnect all the connectors except the one connecting to the screen
2: Plug your device into your laptop/pc and open iTunes
3:Boot your device into recovery mode
4: An IPhone message will soon pop up. click "restore"
5: The Whole process will take 15-20 mins. WAIT PAITIENTLY AND DO NOT USE YOUR DEVICE.
6: Done!!! Please check out my youtube channel for more!!! (https://www.youtube.com/channel/UCWEYIKIkNthla_FTBGRE4AQ)