To Update Selected Elements in the Open DGN File

Using the Element Selection tool, select the elements that you want to update.
Open the Element Templates dialog ( Drawing > Home > Attributes > Element Template > Manage ).
Select Utilities > Update Selected Elements.
The system updates the symbology of all elements in the active selection set that are associated with local templates. If you had used a template while placing elements and had manually changed the elements' symbology so that it no longer matches the template, you can use this menu item to update the elements so that they match the template again. Running this menu item updates only the selected elements that are associated with local templates. If an element that is not associated with a template happens to be selected when this menu item is run, its symbology will not change.