I'm getting "Unknown Error 6" when trying to upgrade my iPhone 4S to iOS 8.1.  The phone is then stuck on the red iTunes logo + USB screen.  How can I get the phone working again?

I've tried upgrading my iPhone 4S using iTunes 12.01.26 on 4 different computers at home and at the office:
Macbook Air - OS X version 10.7.5
Macbook Pro - OS X Yosemite
2 PCs running Windows 7 Professional
iTunes downloaded the installer and the installation process seemed to get 90% complete before showing the error, "The iPhone, "iPhone" could not be updated. An unknown error occurred (6)."
The phone is now stuck on the red iTunes logo screen:
How can I get it out of this mode?
I've tried holding the power button and home buttons down for ten seconds, then letting go of the power button, but keeping the home button down for another 10 seconds.  I've also tried Reiboot, Wondershare Dr. Fone in desperation to try to get the phone out of this mode.  Nothing seems to fix it.
If anyone has any suggestions, please let me know.

i do that but it keeps getting stuck on the 'preparing to restore i phone' screen for a few mins before coming up with 'unknown error 1603'.
Just doublechecking. Have you worked through the 1603-specific instructions from the following document?
[Update and restore alert messages on iPhone and iPod touch|http://support.apple.com/kb/TS1275]

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