Apple released the public version of iOS 9.3.2 on May 16, but many 9.7-inch iPad Pro owners found that
Owners of the latest iPad Pro iOS 9.3.2 received the error “Error 56”, which turns the device into a “brick”. According to Apple's documentation, this error is due to hardware issues, but no specific details were provided. The only fix was to restore the device (up to two times) to not work and led Apple to tell customers to contact Apple technical support.
As a result, Apple released iOS 9.3.2 for the 9.7-inch iPad Pro and reported that all bugs were fixed.
On the same day, Apple officially released a newiOS 9.3.2 version specifically for the 9.7-inch iPad Pro. The new version has build number 13F72 and can be installed over-the-air (OTA) on any 9.7-inch iPad Pro that has not yet been updated.
If you still have error 56 on your 9.7-inch iPad Pro, please post it in the comments.