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Custom System Logo in Big Sur

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Joined
Nov 26, 2018
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Motherboard
GIGABYTE Z390 AORUS PRO WIFI
CPU
i7-8700K
Graphics
Vega 64
Mac
  1. MacBook
  2. MacBook Pro
  3. Mac mini
Mobile Phone
  1. Android
  2. iOS
Screen Shot 2020-11-14 at 5.55.56 PM.png

I finally moved over to Big Sur yesterday. I was a bit surprised when the old path of replacing the system logo didn't work. Took me a bit to figure out how to get it to work, but here we are.

Process I took.

First you'll have to disable secure boot.
Boot into Recovery.
Open Terminal
Code:
csrutil disable
csrutil authenticated-root disable

Reboot.

Ensure SIP is fully disabled.
csrutil status
Screen Shot 2020-11-14 .png

Figure out which is your Big Sur drive.
Screen Shot 2020-11-14 at 10.17.00 PM.png
Screen Shot 2020-11-14 at 7.10.42 PM.png
Screen Shot 2020-11-14 at 6.26.56 PM.png
In my case it's disk 5. With OS X being s5, so for me it is disk5s5, which we will use to mount our partition in order to modify the logo.

Mount the drive and open the relevant folders.
Code:
sudo mount -o nobrowse -t apfs /dev/disk5s5 ~/Desktop/Logo/back
sudo mount -uw ~/Desktop/Logo/back
open ~/Desktop/Logo
open ~/Desktop/Logo/back/System/Library/PrivateFrameworks/SystemDesktopAppearance.framework/Versions/A/Resources/

Backup your current Assets.
Code:
cp -p ~/Desktop/Logo/back/System/Library/PrivateFrameworks/SystemDesktopAppearance.framework/Versions/A/Resources/Assets.car ~/Desktop/Logo/Backup

Terminal copy. If it gives you an error, then manually copy in finder.
Code:
cp -p -f ~/Desktop/Logo/Assets.car ~/Desktop/Logo/back/System/Library/PrivateFrameworks/SystemDesktopAppearance.framework/Versions/A/Resources/

Manually copy Assets.car to ~/Desktop/Logo/back/System/Library/PrivateFrameworks/SystemDesktopAppearance.framework/Versions/A/Resources/

Finally use bless to create a snapshot. If you don't do this, you may have to reinstall the OS on the next reboot (ask me how I know :lol: )
Code:
sudo bless --folder ~/Desktop/Logo/back/System/Library/CoreServices --bootefi --create-snapshot

With the backup of your Assets (or the one I have zipped). You can use ThemeEngine to modify the car file.
The one that works with Big Sur and Catalina is over at github
jslegendre/ThemeEngine/releases

Screen Shot 2020-11-14 at 10.59.42 PM.png
 

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Since you've made it this far. You might as well change your login background.

Replace
/System/Library/Desktop Pictures/Big Sur Graphic.heic

Don't forget to create another snapshot

Code:
sudo bless --folder ~/Desktop/Logo/back/System/Library/CoreServices --bootefi --create-snapshot

LWScreenShot 2020-11-15 at 12.57.48 AM.png
 
Also if you want to go further with the Eye Candy Clover Style, you can also change the look of the Boot Menu Icons and Boot Background Wallpaper to suit the make of your motherboard i.e Asus, Gigabyte, Dell etc, etc.

Edit. I just changed it out for the Orange set to fully depict my Motherboard.
 

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