Over at iMore, Rene Ritchie has passed along a statement from Apple that the company is “looking into a small number of reports that some iPad units are receiving an error when updating the software.” According to an Apple support document, Error 56 might indicate a hardware issue, but Apple recommends first trying to restore the device with iTunes and then contacting Apple support if that doesn’t help. If you have an iPad, particularly a 9.7-inch iPad Pro, we recommend holding off on updating to iOS 9.3.2 until more is known. follow link
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Apple Investigating iPad “Error 56” Problems with iOS 9.3.2