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
Take a look at this link, http://support.apple.com/kb/HT1212?viewlocale=en_US&locale=en_US
iOS: Device disabled after entering wrong passcode
Using iPhone/iPad Recovery Mode