Enable Mode Commands : System administration commands : image delete
  
image delete
Deletes the specified software image.
Syntax
image delete <image-filename>
Parameters
<image-filename>
Name of the software image to delete.
Example
amnesiac # image delete snkv1.0
Product
SCC, Interceptor, SteelHead CX, SteelHead, SteelHead Cloud, SteelHead Mobile
Related Commands
“show images,” “show bootvar,” “show info,” show version