Macbook Air lock screen black background help
My Macbook Air is locked with a lock symbol and bar and I'm unable to log in, please help
MacBook Air (2018 or later)
Question marked as
This one?
"If your Mac is using a firmware password, the lock icon appears when you try to start up from another disk or volume, such as an external drive or macOS Recovery. Enter the firmware password to continue."
Read About the screens your Mac displays as it starts up - Apple Support.