Step 4 details: Replace the “disk1s5” part of the command with proper partition name for your computer. Rename the new file to Catalina.heic and then log out of the account to confirm changes.Move the desired login screen image into the Desktop Pictures folder.Rename the Catalina.heic file to Catalinaold.heic or a different unique file name.Navigate to Computer -> Macintosh HD -> System -> Library -> Desktop Pictures.Enter the following command: “sudo mount -wu / killall Finder”.Open Terminal and enter the command ( see note below) “sudo mount -t apfs -wu /dev/disk1s5/Volumes”.Reboot the system and login as an administrator.Open Terminal in recovery mode and enter the command “csrutil disable”.Reboot system in recovery mode by holding command + r on startup.Steps to change the macOS Catalina login screen image: Prior to completing this task, however, users must first disable System Integrity Protection (SIP) from within recovery mode. heic image in the Desktop Photos folder remains the same. How to change the login screen background image in macOS 10.15 Catalina.Ĭhanging the login screen background picture in macOS 10.15 Catalina is more difficult than in previous versions of macOS.
