Try this: Holddown the power button and home button simultaneously for 15 - 20seconds then release. Soon after you may have to press the power buttonagain to restart the device. The iPhoneshould reset itself without any loss of data. If it boots in recoverymode ( you will be a cable on the screen ) you will need to connect toitunes to restore the device.
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Thats called recovery mode.
All what u should do is restore it,
Download the version you want from www.felixbruns.de and connect your iphone to your itunes, press Shift + Restore and select the ipsw u downloaded and Job Done
Step 1. Turn off your iPhone.
Step 2. Hold down the power and home button.
Step 3. When you see the Apple logo, release the power button but continue holding the home button down.
Step 4. Open iTunes and wait for it to tell you that its in restore mode.try this it will work defenately
turn off your computer and make sure to turn off itunes.
turn it back on including itunes, then plug in your phone.
restore your phone using itunes
if you are not using at&t then go to intotheiphone.com and run thier program to unlock your phone to use it with tmobile etc; if not, then just register it in itunes.
please remember to leave feedback
Your iPhone is not factory unlocked. This means if you purchased it from the USA you need a deactivated ATT SIM card to get it past the activation or use a program called QuickPWN to Jailbreak + Activate your iPhone