I tried to erase my iPad, and got a circle for over an hour. Did a hard reset, all data still there.
go into settings/general/reset/erase all content and settings.
I did, that's how I got the circle, the one that goes around and around... It seems to be frozen in that mode (I tried again).
Did you ever got it fix?
Because I am having the same issue and it seems not to work....!
Retrieving data ...