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Helpful answers
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Aug 12, 2015 3:43 PM in response to JacobEcklesby Carolyn Samit,- Not enough available storage space
- Downloading the update takes a long time
- Unable to reach update server
- Update does not complete
From here > Resolve issues with an over-the-air iOS update - Apple Support
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Aug 12, 2015 3:53 PM in response to Carolyn Samitby SergZak,If none of Carolyn Samit's suggestions work for you, try to delete the already downloaded iOS update off of the device:
Settings/General/Usage/Storage/Manage Storage, then find the "iOS Update" app in the list, tap on it, then tap on the red Delete App button.
After it's been deleted from the device, try to download it again, then try the update again. Sometimes, the download can get corrupted and/or not complete properly.