HT1414: Use iTunes to restore your iOS device to factory settingsLearn about Use iTunes to restore your iOS device to factory settings
Currently Being ModeratedMay 13, 2013 6:00 PM (in response to ashleyd825)
Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device
8. RecBoot: Easy Way to Put iPhone into Recovery Mode - if all else fails.
Forgotten Restrictions Passcode Help
If this method does not work, then you will need to fully Restore your
device as New
Also, see iTunes- Restoring iOS software.