IBM N Series Installation Manual page 52

Activate Backup
Image
Start Diagnostic
Application
Reboot
46
Use option 5 to activate the backup image. The active image becomes the backup
when you select this option. When you exit the Startup Utility and resume the
boot process, the switch loads the image that you activated, but IBM
recommends that you reload the switch so it can perform an entire boot cycle
with the newly active image.
After you activate the backup image, the following information appears:
Image image1 is now active.
Code update instructions found!
Extracting kernel and rootfs from image1
Copying kernel/rootfs uimage to boot flash area
Activation complete
image1 activated -- system reboot recommended!
Reboot? (Y/N):
Enter to reload the switch.
y
Option 6 is for field support personnel only. Access to the diagnostic application
is password protected.
Use option 7 to restart the boot process.
Startup Utility functions