I've never seen a model update get stuck. I have seen the FileWave Admin refuse to update model and complain that it can't contact the inventory server. I'd recommend the same thing though even though the symptoms are slightly different. Close your admin console, log into your FileWave server, stop/restart the server with fwcontrol, and then log back in to see if you can update model this time around. Hopefully that will clear out whatever was causing the problem.