Datamax-O'Neil Netcenter User Manual - Manual (Page 15)

User Manual
4. Operation
The default file to select in the file dialog is firmware.xml. When
opened, NetCenter automatically selects the matching binary
file(s) from the fimware bundle for the printer(s) selected. It is
thus possible to select any combination of printers and upgrade
them simultaneously as long as the printer firmware exists in the
firmware bundle. Before starting the actual upgrade NetCenter
will prompt the user to inform that an upgrade is about to take
place.
During upgrade it is very important not to turn off the power to
the printer(s) since an interrupted upgrade might corrupt the
printer firmware.
After an upgrade all selected printers are automatically restarted.