(You will need to log in as root)
1. Go on google and look for the icon you want and copy it
2. Navigate to Macintosh HD>System>Library>CoreServices.
3.Click on the Finder app and press "CMD+I" to open 'Get info' for Finder.
4. On the top left there should be icon next to the text Finder.
5. Click on the icon and Press "Cmd+V" to paste your new icon there
6. Close the window.
7. Go back to Macintosh HD>System>Library>CoreServices and look for the app called "Dock"
8. Right click "Dock.app" and select "Show Package Contents" and open "Contents"
9. Look for the Image called "finder.png" and copy it somewhere for back up.
10. Go to the image u copied and change the name to finder.png
11. Replace the finder.png in the Dock.app with your new one
12. Close all the windows
13. Open Terminal
14. Type this code in:
sudo rm /var/folders/*/*/-Caches-/com.apple.dock.iconcache
15. Then kill Dock using this command:
killall Dock
16. Once the Dock reopens you're done!
Enjoy

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