To bypass an iPod touch passcode without restoring through iTunes, you need to remove the files that store the password. This is only possible with disk access, which means the device has to be jailbroken. You don’t have to unlock the iPod to perform the jailbreak, as most are automated and can be completed using a computer and USB cable. After the jailbreak, you need software that enables access to the root drive. Warnings Writer Bio

How to Bypass an iPod Touch Passcode Without Restoring It  8 Steps  - 32