To update changes to single symbol, right click on the electrical symbol and select Update.
It will update and attached back any connection to it.
If you want to make changes to whole project
Go to Process , Data ,Update Data
From here, go to Next
Check only Symbols, then Next
Verify the “Existing” and “Replaced by” on the right side, to make sure it is correct symbol is replace and updated.
Hit Finish to apply.
Please take note that this cannot be undone, so I suggest that you make an environment backup earlier , if things went south.
This should update every symbol accordingly.