Try a different cable or unplug and re-connect your cable until your iPad shows on your iTunes screen again and let it re-download the software my iPad lost the iTunes connect image on the iPad screen to download finished but it gave me error 39 second time downloading I will give you my results because I am doing the process as I speak.
Also the iPad that I am working on is not one that I have had iTunes signed in on my computer so it did not ask me to trust it because your iPad will not do that unless is operating in the normal iOS mode where you see your apps on the screen.
I will report back when I'm finished...
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