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Single sup?
If so, load your IOS image where ever you have sufficient space for your image, except for bootflash: (which should be too small for the IOS you want to load).
If insufficient space, free some by deleting or formatting existing storage. (On older formatted storage, you need to squees the storage after deleting files to actually make the deleted space available.)
Once the IOS is loaded, insure any boot system commands have it as the first or only named boot image. If no boot system commands, your IOS image must be the first bootable image on the default storage.
Reload system.
PS:
New IOS image can be copied to sup720 storage using copy command or it can be pre-loaded on external compact flash cards. (When doing the latter, you need to insure the formatting of the card is understood by the sup720.)
