Cisco ASA update using ASDM in Active/Failover


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.

Tim LewisNetwork ManagerAsked:
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to make it easier for me to keep straight, I am using the following:

Active = FW1
       You can use the ASDM wizard that pulls the image directly from Cisco, or you can upload to your ASA.  in either way, you will have to restart both ASA'sorder for the IOS to take effect.  Because you are on a active/standby, I would load the image on FW2 and do a forced reboot from FW1:

failover reload-standby

after FW2 comes up

ensure it is still in standby mode:
show failover
#########look for the following#######
Other host: Secondary - Standby Ready
make FW2 active and reboot FW1.

no failover active

after FW1 reboots, issue the command:
failover active

you should not have any downtime.  however, because this is a network, and nothing ever goes as planned, you might want to schedule some downtime.  

I would also back up your current config files, and IOS images just in case.

I hope all goes well

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