Make sure as @PhoneBoy said to confirm that cluster object is indeed set to R81.10 on smart console for the cluster. If you can ssh into the appliance, verify the policy by running fw stat.
IF it shows initial policy, that should let person at least ssh into the box AND also web UI, but only on port 443, nothing else. If you use a different port for web UI, then you can just run fw unloadlocal and access it,
However, if fw stat shows defaultfilter, you have no choice but to run fw unloadlocal, as defaultfilter blocks everything.
Hope that helps.
Andy