Can't restore iPad 2 with new iTunes... error 9
Hey I had the same issue as well.

After a lot of searching I found an answer on one of the Apple Discussion Threads.
Try installing Wondershare Dr.Fone for iOS and follow the instructions on the screen.

At the least it should recover the data on your device and let you use it as it was in it's earlier state.

I'm yet to find out how to update my iPad 2 through iTunes without the silly error 9.
I'll edit my answer when I do so.