I own a 2012 Macbook Pro with retina display. I'm trying to follow the recommendation of Undercover, an anti-theft software by setting a firmware password. I'm hesitating because there's no documentation on whether it's possible to replace the old password with a new one (knowing my own password!), or just to remove it and reverting the system back to a "no-password" state in the future. Can anyone with experience in setting firmware password help? Thanks a lot.