i am sending my mac book air back for repair. How do i remove my password and what is a firmware password

Hi corrie281,

If you already made a backup, you can erase your Mac to remove all of your data from it, including your password. Just be sure to sign out of iCloud first (in System Preferences -> Apple ID).

A firmware password is a special low-level password that is disabled by default. It is different than your regular login password. When a firmware password is set, you can't use most of the special boot options, and you have to enter the password before you can start up from a different disk or operating system, or from macOS Recovery.

In order to remove the firmware password, you have two options:

• If your Mac has the T2 Security Chip, you can restore (not revive) the T2 Security Chip firmware. This process erases all data and removes the firmware password. You'll need to activate your Mac and reinstall macOS afterwards.

• If your Mac doesn't have the T2 Security Chip, or if you want to preserve your data, you will need Apple's assistance to remove the firmware password. You can contact Apple Support here: Get Support

You can leave your password but be sure you have guest user activated so the tech can start your Mac. to check and make repairs otherwise erase all files as noted by Encryptor5000.