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iOS 9.3.2 is causing problems for some 9.7-inch iPad Pro owners



From MacRumors:
According to Apple's error code support document, error 56 is a hardware issue. The document recommends installing the latest version of iTunes, checking for issues with third-party security software, and attempting a restore twice. Apple recommends customers who are still seeing the error message contact Apple support.

With a number of users affected by the bricking issue, Apple will likely need to release an updated version of iOS 9.3.2 that solves the problem.
  iOS 9.3.2 Bricking Some 9.7-inch iPad Pro Devices With 'Error 56' Message