Cisco Cisco 5760 Wireless LAN Controller Technical References

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If you are using the archive download-sw privileged EXEC command to maintain system images, you never
need to use the boot system command. The boot system command is automatically manipulated to load the
downloaded image.
This command changes the setting of the BOOT environment variable.
Consolidated Platform Command Reference, Cisco IOS XE Release 3SE (Cisco WLC 5700 Series)    
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boot system switch