Nortel Meridian 1 Option 11C Upgrade Manual page 175

Upgrade Option 11C/11C Mini software to a new release
5 Select the method of starting the Software Installation Program.
Please read this important message on upgrades
There are two methods of starting the Software Installation Program.
When you upgrade from Release 22 to 23, 22 to 24, or 23 to 24, you
must use the SYSLOAD method of upgrading.
Toggle power supply to OFF and then to ON. During the reboot, press
Ctrl+I to access the Installation Program.
You cannot use the UPGRADE command to correctly upgrade from
Release 22 to 23, 22 to 24, or 23 to 24.
If you try the UPGRADE method, an invalid keycode message
displays. If you get this message, restart using the SYSLOAD method.
Log in to the system and select LD 143. Type UPGRADE to access
There are two methods of starting the Software Installation Program:
— Use the UPGRADE command in Overlay 143. Continue to next
step.
— Press Ctrl+I when prompted during a SYSLOAD (go to Step 7 on
page 171).
CAUTION
SYSLOAD method
UPGRADE method
the Installation Program.
Option 11C and 11C Mini
Page 175 of 224
Upgrade Procedures Guide