It appears that today's iOS 9.3.2 update is causing problems for some 9.7-inch iPad Pro owners. As noted by MacRumors, a number of users have taken to Twitter and other forums to complain that the firmware bricked their tablets shortly after installing the over-the-air update.
More specifically, users are seeing an "Error 56" message, which instructs you to plug your device into iTunes. According to some of those who have received the error, however, plugging the tablet into your computer and trying to restore through iTunes doesn't resolve the issue.