Extreme Networks WM-4T1i WAN Installation And User Manual page 15

Installing the WAN Module Software
The module can store up to two images; a primary and a secondary. When you
download a new image, you must select into which image space (primary or secondary)
the new image should be placed. If not indicated, the primary image space is used.
You can select which image the switch or module will load on the next reboot by using
the following command:
use image {slot <slot>} [primary | secondary]
WAN Module Installation and User Guide 1-7