The UPS Module has 3 default accounts, (admin,fwupgrade,user) , fwupgrade has a shell access to the device BUT if you try to get access to the shell a shell script closes your conection. To stop the shell script and avoid to terminate your connection you should , set your SSH client to execute "/bin/bash" after you logon the SSH. As a result your shell type will be changed to "/bin/bash" as you see below there is an account called "eurek" and ofcourse it's password also is "eurek". Since that "eurek" is a sudoer user you will get full access to the device.