For those of you having trouble downgrading to the older 3.1.3 firmware or even older versions of iPhone firmware, this tutorial is for you.
This tutorial fixes the problem – This device isn’t eligible for the requested build”
I show you how to modify the host file on a windows computer to fix this error. See the video after the jump:
I have done this step along with the downgrade video, however I still get ERROR 3194. I am trying to downgrade an iPad 4.2.1 that I bought used but would like to downgrade to 3.2.2