Respect privacy. Facebook’s locked profile feature is designed to protect users from unwanted viewing of their photos and information. If someone has locked their profile, they likely don’t want non‑friends seeing their cover photo in full detail. The safest and most ethical approach is to send a friend request or move on.
) to view a mobile version of the page, where long-pressing a thumbnail might allow a low-resolution download. Inspect Element: fb locked profile cover photo viewer