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

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. 

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