Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions
Forgotten Restrictions Passcode Help
You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.
You can restore from a backup if you have one from BEFORE you set the restrictions passcode.
Also, see iTunes- Restoring iOS software.
FORCE IPAD INTO RECOVERY MODE
1. Turn off iPad
2. Turn on computer and launch iTune (make sure you have the latest version of iTune)
3. Plug USB cable into computer's USB port
4. Hold Home button down and plug the other end of cable into docking port. Do not release button until you see picture of iTune and plug.
5. Release Home button.
6. iTune has detected iPad in recovery mode. You must restore this iPad before it can be used with iTune.
7. Select "Restore iPad"...
Note: Data will be lost