Answer:
There's no way for anyone but you to know the password. Consider this a lesson to be learned - keep track of your passwords (and do it securely). If you can't remember your password for this, the only alternative is to factory reset your device.
I don't know exactly if this passcode instance is tied to your Icloud account.. if it is, factory resetting will have been a waste of time if you sign back into your Icloud account. In this case, you would need to make a new Icloud account to use.
