4S update from 7.1.2 to 8.1.2, says Software update failed

The device is confirmed it is a 4s, but we never upgraded to IOS 8 yet.  I continue to get the Software Updated failed and the close and settings box comes up.  Whichever you click on it goes back to the update screen.  I am on very fast Wifi and the device is plugged in.  Two days ago it said there was not enough space, so we deleted videos and now there is 5.7 GB available.  I tried to update through ITunes, but the internet is too slow at home and it says 20 hours to update.  We tried that twice and after 15 hours the "software update failed" notification comes up.  Any ideas?  I also turned off the phone and turned it back on.

I would reset the phone - no data loss involved - and try again
Restart or reset your iPhone, iPad, or iPod touch - Apple Support

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