Upgrade Active/Failover ASA Pair

At work we have two ASA 5520’s that are configured as an active/failover pair. Here are the steps that we use to upgrade them.

1. Download the ASA software image and the ASDM image from Cisco
2. TFTP both files to both of the ASA’s
3. Console directly to the Primary ASA and type the following commands:
   1. 1. 1. Config t
         2. Boot system disk0:/NewASAimage.bin
         3. Asdm image disk0:/NewASDMimage.bin

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