It's hard to believe that someone would actually "buy" one, but if you take this part at face value, "Kobo Ereader Original" those instructions are probably incorrect.
Unfortunately, I don't think I ever even registered mine back when I had one, so I don't know the steps.. but since the device would have no wifi, everything would have to be done through the Kobo Desktop application on the PC.
Edit: Here's the manual for the original Kobo reader. *If* this is indeed the device in question, instructions to perform factory reset are on page 61.
http://download.kobobooks.com/learnm...r_guide1-5.pdf