AT&T MERLIN LEGEND Release 3.0 System Programming And Maintenance Manual page 85

Upgrading the System
5 Perform a System Erase (frigid start).
Use the following procedure to ensure that all system programming is
returned to default values.
Maintenance>Slot>00>Demand Test>System Erase (Line 5, left button)>
System Erase (Line 5, left button)> Yes
The System Erase option is not displayed on the screen to prevent accidental
erasure of system programming. See Maintenance and Troubleshooting for
additional information about System Erasure.
5 Convert your backup file to Release 3.0 format.
This procedure converts the backup file created in Step 2. See "Convert."
6 Restore your system programming.
The system is forced idle and cannot be used during this procedure. See
"Restore."
System Programming and Maintenance (SPM) 67