Good evening, first question with answer, is that once the icon created and placed in the resource your current has not changed? (imagine that in the file info.plist you have named the icon) in this case you may have to delete 2 files to find the new icons below I leave you an applescriipt script that delete them 2 files that the system recreates automatically. in the script you have to change "yourname" and "yourpassword" by your username and password otherwise it will not work. once launched the script the screen will go black and reappear, I put xtrafinder, if you do not use it, erase the line with xtrafinder.
try
set erase to do shell script "sudo find /private -name" & quoted form
of "com.apple.dock.iconcache" user name "yourname" password
"yourpassword" with administrator privileges
do shell script "echo" & quoted form of erase do shell script "sudo rm
-rf -v" & quoted form of erase user name "yourname" password "yourpassword" with administrator privileges
set erase to do shell script "echo" & quoted form of erase & " | sed 's
com.apple.dock.iconcache#com.apple.iconservices#'"
set erase to do shell script "echo" & quoted form of erase
do shell script "sudo rm -rf -v" & quoted form of erase user name
"yourname" password "yourpassword" with administrator privileges
do shell script "sudo killall Dock" user name "yourname" password
"yourpassword" with administrator privileges
do shell script "sudo killall iconservicesagent" user name "yourname"
password "yourpassword" with administrator privileges
do shell script "Sudo killall Finder" user name "yourname" password
"yourpassword" with administrator privileges quit application
"XtraFinder"
do shell script "Sudo open -a /Applications/XtraFinder.app" user name
"yourname" password "yourpassword" with administrator privileges
do shell script "sudo pkill loginwindow" user name "yourname" password
"yourpassword" with administrator privileges
end try
