How to upgrade ASA 5520 HA cluster from Software Version 8.2(5)59 to 8.4 or later version

[jyoti_prakash85@yahoo.com]

Hi All,

I would like to upgrade one ASA 5520 HA cluster from Software Version 8.2(5)59 to 8.4 or later version. I heard it is not easy to do. Anyone has done this before and any known issues. 

[balaji.bandi]

Read the good discussion here :

https://networkguy.de/?p=1284

https://community.cisco.com/t5/firewalls/asa-8-0-to-9-x-directly/td-p/2260344

https://community.cisco.com/t5/firewalls/upgrade-asa-5520-8-2-to-newest-version-9-1/td-p/2369307

https://community.cisco.com/t5/firewalls/asa-5520-upgrade-from-8-2-to-9-1/td-p/2231586

[jyoti_prakash85@yahoo.com]

thank you so much Balaji.