MAJOR WARNINGS: Following this procedure will apparently leave your Mac in a state in which you cannot use FileVault, and must leave both Signed System Volume (SSV) and System Integrity Protection (SIP) off. I describe the procedure below, but first: ![]() I have managed to modify this file and set the Login Screen to show my company's logo, as desired. That controls the just-after-boot user selection screen in a multi-user setup (hereafter the "Login Screen" as many other posters have termed it). I have verified that as conjectured in previous posts, it is exactly the file /System/Library/Desktop Pictures/Big Sur Graphic.heic Please format your posts so they are easier to read rather then packing it into one block of text. If you don't want to follows the steps to change the login screen background that's on you. ![]() I think what happened was the Desktop Pictures folder in Macintosh HD > Library > Caches > somehow over the beta period disappeared which caused the pictures to not sync to the login screen. You could check out OnyX when it's released for Big Sur and see if it allows you to change the login screen if you want to keep File Vault enabled and use your machine with multiple users. I don't use File Fault so that's not an issue nor multiple users but would like the ability for it to work under the guest user if it's enabled. I followed the instructions and it worked for me. They could address the login screen issue in a future software update though or you could submit feedback via product feedback. It's amazing how they can push out updates to software and hardware like they do year after year and keep things running smoothly as possible. I've been a long time Mac user as well, since the early 90s, MacOS 7.5 days so understand your point about being loyal.Īpple has changed, back then there was no iPhone or iPod, or app store which made then popular. Right now that "lock screen.png" matches my login background, not the colorful Big Sur restart wall paper.? Tested on a 2018 MBP and works perfectly.Ĭan we see a screen shot of your modified folder as you indicate: /Library/Caches/Desktop Picturesįor clarity are you saying create another sub folder with a tile of the UUID?ĭo you place another picture in that folder, do you name with UUID number or do you name it "lock screen.png" ?ĭo you delete the old "lock screen.png" ? Restart computer.īig Sur will now always create a lockscreen.png file in the UUID folder matching the current wallpaper. Make sure FileVault and Guest user are deactivated. Grant permission to Read & Write to user, admin, everyone. Inside Desktop Pictures create folder with UUID value as name. ![]() If it doesn't exist create Desktop Pictures folder. Right click on user in left column > Advanced Options. Just sharing a solution I've found on Stack Exchange.
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