I am looking into updating our ASA 5515 firewall. It is an active/standby configuration. I was looking at the upgrade tool built into the asdm and was hoping to use that. Does anyone have experience using the asdm for updates, do I just run through the wizard and it does it all? Can i perform this during the day with very little downtime? Which ASA should I upgrade first, active or standby? And I am on ASA version 9.1.2, should I go straight to the newest 9.5.1? Any help is appreciated.