On top of that here you can choose which firmware version you want to use. You are also able to customize your phone. If you use SEUS it may upload new CIDs to your phone making it more dificult for you to accses the phone's software at your will. That's what happened to me, It converted my phone to CID 52 and now I can't flash it whith any other than SEUS or a payed service.

Anybody correct me if I'm wrong