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I've made a small Swift program that does all this for you (it detects the OS version and works both on Mojave and earlier versions). * I've only tested this with JPEG images, but it may work for other types. Changing a login option will make System Preferences change the EFI system's settings, including picking up the wallpaper change. This is because when you boot with FileVault, at the login screen your system hasn't really booted up all the way! It's actually running a tiny system on your EFI partition, since your main partition is encrypted. Just change it back if you don't actually want it changed. For example, whether to show a list of users or name and password fields. If you have FileVault enabled, change a login option in System Preferences. Don't worry if it's JPG or similar, it'll still work even after you rename it to Mojave.heic.* If you don't know your screen resolution, you can go to  > About This Mac. Get your new image and scale/crop it to exactly fit the display.

This does not require disabling SIP, as it's in /Library.īack up /Library/Desktop Pictures/Mojave.heic by copying it to or similar. You can do this by replacing the Mojave.heic default desktop background.