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Helpful answers
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Mar 31, 2016 12:13 PM in response to thucnga92by Skydiver119,Do you have a computer? Try to connect your phone to a computer and then update via iTunes
If not, go into the settings, usage, and find the 9.3 update and delete it. 9.3.1 is the most current build and the one currently signed by Apple. It's possible that you're trying to install the older version - and Apple pulled that for some older devices. You may basically be trying to install a software version that's no good now which is why it's erroring out.
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Mar 31, 2016 2:10 PM in response to thucnga92by OriginalName022,This might still be helpful, even though 9.3.1 is now out: If you can't update to iOS 9.3 on your iPhone 5s or earlier, iPad Air or earlier, or iPod touch - Apple Support