To update JANOS, the JNIOR Series 4 Operating System, you will need to do two things.
/temp directory.jupdate command. To force the update to happen immediately upon entering this command we will type jrupdate -fup /temp/janos_filename.updThe easiest way to update the unit remotely is using the DCP The DCP is most likely to be available on a remote JNIOR because it uses a single port for all of the features. Without the DCP you might need port 23 for telnet, port 21 for FTP commands, and many other ports for FTP data.
If the DCP is available follow this procedure.
/temp directory.
jrupdate command. Like above, to force the update to happen immediately upon entering this command we will type jrupdate -fup /temp/janos_filename.upd 
Here is a YouTube video to show you how to perform the update without the Support Tool. The Support Tool offers a lot of benefits but is not always necessary.