My iphone won't turn on past the apple logo. What can I do? '?

This morning i woke up and my phone displayed something on it stating I needed to upgrade my software to the iOs6. I turned my phone off and didn't upgrade it because I was in a rush. Now my phone won't turn on past the silver apple logo.
Additional info: Its an Iphone 4 16GB

Take it to an Apple store or your cell phone provider.

>>>>>THIS PROCESS WILL DELETE EVERYTHING ON YOUR IPHONE<<<<<
1.) Put your device in DFU mode. While plugged in to the computer, turn off the phone. Hold the power button for 3 seconds, then also start holding the home button. When the screen turns off, let go of the POWER BUTTON. Keep holding the home button until your phone appears in itunes as "Recovery Mode".
2.) Then click on the RESTORE button and itunes will download the iOS 6 firmware and restore your device.
3.) Your iPhone should now be working!

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