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If admin account name is changed and converted into standard account , enter in single user mode .
Execute this command .
mv /var/db/.AppleSetupDone /var/db/.OldAppleSetupDone
Then press enter key after that .
Restart the Mac , then it will prompt language then create a new user account .
Note : In the first terminal command there is space after mv and also space after AppleSetupDone .
Question: I can’t open the lock icon in users & groups