What is baseband?! I keep going around to forums all over the internet, because i am worried about what will happen if I install the 3.0 firmware and then change my mind. I have seen videos on how to downgrade (just put into DFU mode and custom restore), but the word 'baseband' or 'baseband error' keeps popping up and I AM NOT about to upgrade without full knowledge of what this is. I think this might just be for iPhone users, but I'm not sure. Help?