BCwrangler
Newbie
There is a way around your problem. You could use the method discussed here to root your phone and then install Mobile Odin from the Play Store and flash the latest firmware without using a PC.
Tried 3x too get this root to work....I went back and noticed on the top of the XDA thread that it only works for ICS phones. I'm glad that you showed me mobile odin....now I just got too get the phone ready for it.