I turned my iphone 4s off during update now it's stuck on itunes screen?

I was downloading the newest version of ios and as I was doing so my phone turned off I think from low battery and now it's stuck on itunes screen I tried to restore it but it said error.

-Hold the power button for three seconds
-hold the home button whilst still continuing to hold the power button (hold power and home) for 10 seconds
-after the 10 seconds is up, let go of the power button but continue to hold the home button for about ~15 seconds

It should just be a black screen but your phone should be in DFU mode. Plug into itunes and do a full restore. Once your phone is at factory settings, you can sync it back up and get everything back.

Lol smash it

You should keep your iPhone enough power before iOS update. Now it seems that your iPhone stuck on Recovery Mode (the interface "An arrow pointing to iTunes icon"). You can use Tenorshare ReiBoot to put your iPhone out of this recovery mode screen.

Totally free tool provided by Tenorshare, you can download it from: http://www.tenorshare.com/products/reiboot.html

Or watch this video to learn detailed steps