HT4623 While update there is an error and my iPhone stop, how to restart

Please help to restart my iphone4

Perform a hard reset on your iPhone (press the Home button and the Sleep to screen off)
Connect the USB cable to your iPhone and launch iTunes
It's time to position your iPhone into DFU mode (Device Firmware Update) how: Press the Home button and the Sleep for 10 seconds (remember 10 seconds!), After ten seconds, release the sleep button and press and hold the Home button for 10 seconds (if you do it all correctly and the time is right) then it will display a message from iTunes like this.
If you do not get a message like that, repeat step 3, until you get a message like the above on your iTunes.
After step 3 successfully, iTunes will start restoring your iPhone firmware to its default alias originis firmware
After the restore process is complete, your iPhone will reboots and if your iPhone is connected to iTunes, so flame, iTunes will offer the iPhone restore from backup that you created (which will restore the contacts, music, video, photo, and application), if you previously never backed up your iPhone, you should select this option.
The process of backing up restore your iPhone will take approximately 2 to 3 hours, so you should be patient.
Once completed, iTunes will inform you and your iPhone will reboot again
The next process, sync your iPhone your iTunes, if the iPhone has been running with the normal synchronization process would not be a problem.
Congratulations, your iPhone is running normally again.

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