Well, i bought an iphone on ebay and I'd like to upgrade the firmware, but I'm a little nervous. So here are the details: Firmware 1.0.2 Not sure what's already been done to the phone... Installer not working Unlocked, I'm using it with t-mo I use windows xp. Could i just go to itunes and click restore, then use ziphone or something? Or what about iliberty? Im just scared of ruining the phone, so any helpful advice/reassurance would be appreciated... Thank you.