I have a Cisco RV042G Small Business Router that shows up as an unknown device.
The SysObjectID in the Node Details section is 0.0.0.0.0.0.0.0.0.0.0.0 but I am pulling in the model & firmaware version using 1.3.6.1.4.1.9.6.1 & displaying the columns that correspond to 105.1.1.0 & 105.1.4.0