have you tried
Holding the home button and the power button for 20 seconds
DFU Mode
- Connect your device to your computer using a USB cable.
- Turn off the device.
- Press and hold the Power button for 3 seconds
- Press the Home button while holding the Power button and hold both for 10 seconds.
- Release the Power button, but KEEP HOLDING the Home button.
- After about 15 seconds, iTunes will tell you it has detected a device in Recovery Mode.
- Restore your device
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Also Why do you need to restart your phone is it a problem with the iPhone or do you just want to do it
Also this will get rid of everything on your iphone
<Link Edited by Host>