Forgot the Passcode?
You'll need to restore the iPod Touch.
If the iPod Touch is not being recognized in iTunes
Updating and Restoring iPod touch Software
You can use iTunes to update or reinstall iPod touch software, restore default settings, and delete all data on iPod touch.
• If you update, the iPod touch software is updated. Your downloaded applications, settings, and data aren’t affected.
Note: In some cases, an update may also include restoring iPod touch.
• If you restore, the latest version of iPod touch software is reinstalled, settings are restored to their defaults, and data stored on iPod touch is deleted, including downloaded applications, songs, videos, contacts, photos, calendar information, and any other data. If you’ve backed up iPod touch with iTunes on your computer, you can restore data from the backup at the end of the restore process.
Deleted data is no longer accessible via the iPod touch user interface, but isn’t erased from your iPod touch. For information about erasing all content and settings, see “Resetting iPod touch” on page 122.
Update or restore iPod touch:
For more information about updating and restoring iPod touch software, go to www.apple.com/support and search for HT1414.