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I can't speak to that particular release but I am running IPv6 using ASDM with ASA code 8.4.1 with ASDM 6.4.1 without problems.If you go to Configure and the Edit Interfaces, if you don't see an IPv6 tab on the top then you will have to upgrade.
You need to explicitly permit ICMPv6 through the firewall. Not only echo replies but path mtu ICMPv6 messages are also a good idea to let through.Sent from Cisco Technical Support iPhone App
