Aside from the IOS version, you will also have to worry about the NAT configurations as they are no longer the same. The new format started in 8.3 but you are still at 8.2 so you need to plan that one as well.
Go to 8.4(6) first. Then to 9.1(3) or later. That's what's recommended by Cisco (reference) and I agree. You can go straight to 8.4(6) from any 8.2 (x) release.
As noted by the earlier poster, check your migrated NAT for proper function (and for opportunity to clean it up) as it changes significantly. The cli parser will migrate it for you automatically, but it may not always be pretty. :)
As noted in the release note I linked above, "The units in a failover configuration or ASA cluster should have the same major (first number) and minor (second number) software version. However, you do not need to maintain version parity on the units during the upgrade process; you can have different versions on the software running on each unit and still maintain failover support. To ensure long-term compatibility and stability, we recommend upgrading all units to the same version as soon as possible."
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...