I do not how this gets updated, there is probably some background admin process that has to take place. All I can do is to ask a moderator how this is supposed to happen, and whether it can be initiated by a back office team. They may post here.
I know the helpdesk can normally force a restart, so they must have a process to identify the hub serial number by looking at your connection.
Not sure this helps much but I ran a SH for a short while in December. That had been offline for probably three or four years but updated quickly to the same version you're showing. So that would at least suggest that firmware isn't the issue.
But I've never used the MyBT app, so don't have any experience of remote restarting.