Apple today released a new version of iOS 9.3.2 that’s specific to
the 9.7-inch iPad Pro, presumably resolving an issue that caused
some iPad Pro devices to become bricked after installing the
original iOS 9.3.2 update.
The new version of iOS 9.3.2, build 13F72, can be downloaded
over-the-air on any 9.7-inch iPad Pro that has not previously been
updated to the latest version of iOS 9.
A friend with a bricked-by-“Error 56” iPad Pro told me that he was able to un-brick his iPad by installing this version of iOS through iTunes. He had to go through a few reboot cycles, but it worked.