
CHAPTER
11-1
Cisco PIX Firewall and VPN Configuration Guide
78-15033-01
11
Changing Feature Licenses and System Software
This chapter describes how to change (upgrade or downgrade) the feature license or software image on
your Cisco
PIX Firewall. It contains the following sections:
• Upgrading Your License by Entering a New Activation Key
• Using HTTP to Copy Software and Configurations
• Downloading the Current Software
• Installing and Recovering PIX Firewall Software
• Downgrading to a Previous Software Version
• Upgrading Failover Systems from a Previous Version
• TFTP Download Error Codes
PIX Firewall displays a warning message if the configuration file (stored in Flash memory) is newer than
the PIX
Firewall software version currently being loaded. This message warns you of the possibility of
unrecognized commands in the configuration file. For example, if you install Version 6.0 software when
the current version is 6.2, the following message appears at startup:
Configuration Compatibility Warning:
The config is from version 6.2(1).
but the image is version 6.0(1).
In the message, “config” is the version in Flash memory and “image” is the version you are installing.
Caution Before upgrading from a previous version, save your configuration and write down your activation key.
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