I tried to update my iPhone to iOS 7?

So the smart person that I'm, I tried to update it using utorrent, well i updated it and it was okay but i didn't like it so i decided to downgrade it back to iOS 6.1. 3 and i accidentally did not press the option key when clicking on the restore button so basically it just restored to iOS 7, now when the phone is on it tells me this "This device is not registered as part of the iPhone Developer Program. If you are a member of the Program, please register your device in the iPhone Developer Program Portal." WHAT AM I SUPPOSE TO DO!

I have the SAMMMEE PROBLEM! Driving me NUts!

You can get out of that. Enter DFU mode by doing this:
Hold down the power button for 10 seconds
Then, still holding the power button, hold the power and home button for 15 seconds.
Finally, release the power button and hold the home button for 3 seconds or so until the computer beeps.
iTunes will pop up saying that it has detected your device in recovery mode. You must restore it to use it. You can then restore to iOS 6.1.3.

You have to register your iPhone as a developer device. You can do so from udidzone.com