There is a tool that can be used to update a RoundTable device which is RTManage.exe, we can use OCS Software Update Server to do this job as well.
RTManage.exe is a tool you can use to manually update the Roundtable device without requiring the OCS Software Update Server. Once you download and install the tool, the usage is via the command line. All you need to do is connect the device via a USB cable to your machine and you should be able to update it via this tool.
Read more at source: http://communicationsserverteam.com/archive/2009/01/23/355.aspx