step 1:導入IOS
ASA5520# copy tftp flash
Address or name of remote host []? 192.168.1.2
Source filename []? pix722.bin
Destination filename []?pix722.bin
step 2:更改啟動操作系統的順序 
ASA5520#show run boot
boot system disk0:/asa707-k8.bin
boot system disk0:/pix722.bin
ASA5520#configure terminal
ASA5520(config)#no boot system flash asa707-k8.bin
ASA5520(config)#no boot system flash pix722.bin
ASA5520#copy running-config startup-config
ASA5520#show run boot
boot system disk0:/pix722.bin
boot system disk0:/asa707-k8.bin
                    
                
                
            
        
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