Upgrade firewall software in failover pair

I need to upgrade two firewalls (in failover pair) remotely. Could somene tell me what is the way to go forward? Do I need to worry about licenses and stuff?
Thanks,
Kashish

Since you are running dynamic routing protocols, the routing instand is only active on the primary active firewall, not both. That's the reason why you can't access the tftp server on the standby unit.
What you can do is upload the image to the primary active ASA, then failover the firewall to the secondary standby ASA. Once the secondary ASA becomes the Active ASA, then you can upload the image to this ASA.
Since you can only access the active unit, once you have configured the boot system with the new image, and save the config, then you can reload the ASA one at the time.
Reload the secondary after you have uploaded the image, this will cause failover to the primary. Monitor the status of secondary by issueing "show failover", and once the secondary is up, and the software has been upgraded, then you can reload the primary active unit.

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