If Settings>General>About shows your iPad is on iOS 9.3.1 then the update was successful.I done my update NOW plz tell me when I go setting it show ur r updated 9.3.1. Now if I want to check it OTA or computer did and options if no then forget it and tell me what about hanging which describes before.
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If you mean when the update stops before completion it usually means you have a weak internet connection or the signal was interrupted for some reason.And what about hanging
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