Hello, I am Engineer John C., welcome to JustAnswer and thank you for asking your question.Please remember I do not receive a salary from this company. I am an independent Computer Science Engineer with more than 10 years of experience working with Apple devices, and now working here. The only way for me to be compensated for my time is when the customer (You) click the Accept button when satisfied. Thank you for your help and understanding.
OK, we need to put the iPhone in DFU mode, then restore it from itunes.
Please make sure the iPhone is connected to your computer with the USB cable and iTunes is open on your computer, then please follow the steps below to put the iPhone in DFU mode.
Click here -----> http://www.youtube.com/watch?v=bITIiGswjFI
to see a step by step video to put the phone in DFU mode
When the iPhone is in DFU mode (iTunes will say it to you), then right click the iPhone icon under "Devices" on the left of iTunes (on the computer) and select Restore. Then select the newest backup and restore it.
Please let me know if the issue is not solved clicking the "Reply to your expert" gray button, so we can continue troubleshooting.
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Computer Science Engineer