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.
My son gave me his ipod but he forgot his passcode, How can I unlock his passcode
If you cannot remember the passcode, you will need to Restore the device...
Connect to iTunes on the computer you usually Sync with and Restore...
If necessary Place the Device into Recovery mode...