error 39 when trying to update iPad will not turn on
I have an ipad 2 64. It had iOS 8.1. I tried to update to iOS 8.1.2 today. When I came back to my ipad it had a picture of an ipad cord pointing to a red circle with the word itunes in it. I have connected to itunes downloaded all updates then tried to restore my ipad I continually get error 39. I have tried this on 3 different windows cpus. I always get error 39. I am not even able to get my ipad to boot past the screen with the picture of cord and arrow. Thanks
iPad 2, iOS 8.1.2, 64