How to access locked notes with new password old password is lost

chelino226 Said:

"How do I unlock old password when I forgot the old password"

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Try Recovering Notes:

1. Go Here: How to Lock Notes on your iPhone, iPad, and iPod touch - Apple Support
2. Scroll to: If you forgot your notes password
3. Proceed from there as necessary

There is no way to access notes without the password used to lock them. You were warned that this was the case when you created the password, and it was suggested that you create a password reminder. If you did enter the wrong password and you will be shown the reminder.

I gave the short answer, which is the same as the long answer in How to Lock Notes on your iPhone, iPad, and iPod touch - Apple Support, If you forgot your notes password.