ASG-110 upgrade 8.306 to 9.xx

I get this message after upgrading to 8.306. I do NOT use HA or Cluster setup.

Any idea? I would like to try ver. 9.xx.

"A product upgrade to version 9 is available. However, since you are using a HA or cluster setup, you cannot upgrade at the moment, because the upgrade does not yet support HA/Cluster systems."