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Cisco ASA 5500 Series Configuration Guide using ASDM
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Chapter 75 Managing Software and Configurations
Downgrading Your Software
4. Saving the running configuration to startup (write memory). This sets the BOOT environment
variable to the old image, so when you reload, the old image is loaded.
5. Copying the old configuration to the startup configuration (copy old_config_url startup-config).
6. Reloading (reload).