While many "exclusive" tools claim to "unlock" these images, they generally rely on one of three things: Lock your Facebook profile | Facebook Help Center
Facebook officially states that when a profile is locked, only friends can see the full-resolution profile picture or cover photo. What is a Facebook Locked Profile? fb locked profile dp viewer exclusive
Locked profiles often display a blue lock icon or shield on the profile picture. Can You Actually View a Locked DP? While many "exclusive" tools claim to "unlock" these
The Reality of FB Locked Profile DP Viewer "Exclusive" Tools fb locked profile dp viewer exclusive
Facebook's "Profile Lock" is a privacy feature that allows users to restrict their content to friends only.
Non-friends see a limited view. They cannot click to zoom or download the current profile picture or cover photo.