Solution for changing Big Sur login wallpaper to custom.

This procdeure changes litteraly only the "login" screen, isn't? I mean, you still have the big sur wallpaper every time you switch on the machine, right? (For login screen i mean the one you see when you logout from your account)

applewarm wrote:

1. Just sharing a solution I've found on Stack Exchange. Credit to whoever discovered it.

System Preferences > Users & Groups.

2. Open lock to make changes.

3. Right click on user in left column > Advanced Options.

4. Copy UUID value.

5. Go to /Library/Caches/Desktop Pictures.

6. If it doesn't exist create Desktop Pictures folder.

7. Inside Desktop Pictures create folder with UUID value as name.

8. Right click on folder > Get Info.

9. Open lock to make changes.

10. Grant permission to Read & Write to user, admin, everyone.

11. Make sure FileVault and Guest user are deactivated.

12. Change desktop wallpaper.

13. Restart computer.

Big Sur will now always create a lockscreen.png file in the UUID folder matching the current wallpaper.

Tested on a 2018 MBP and works perfectly.

Enjoy!

Can we see a screen shot of your modified folder as you indicate:

 /Library/Caches/Desktop Pictures

Here is what I see by default:

for clarity are you saying create another sub folder with a tile of the UUID?

Do you place another picture in that folder, do you name with UUID number or do you name it "lock screen.png" ?

Do you delete the old "lock screen.png" ?

Right now that "lock screen.png" matches my login background, not the colorful Big Sur restart wall paper...?

Awesome! You made my day, applewarm! Huge thanks for this!

Ok will try this thanks , why the bloody **** don’t Apple just put it as an option in the preferences ? 🙄🙄

I finally got it to work 😅 Omg thank you!!!!

I am trying to change the screen prior to login - the Big Sur screen when you boot up. That's the screen that irritates me.

Which Library is this? Your user Library > Caches or Macintosh HD > Library > Caches?

I assume it's Macintosh HD > Library > Caches.

That's a screenshot of Macintosh HD or in my case MacOS Big Sur > Library > Caches. it looks like I don't have the Desktop pictures folder. I wonder why one might have it and other don't?

Thanks, please clarify.

I think also that we must be certain to have filevault turned off. I tried the procedure whit filevault still active and it didn't work. I'm decrypting the disk right now and then i'll try again

Yes, i gave it a try whitout decrypting the disk, because i knew it would have required a while. But it didn't work ahahah the new png has been created but it didn't change the starting wallpaper