![](https://discussions.apple.com/content/attachment/7f754be9-cf44-42ff-896e-fd18a30c0989)
You need to have a good Service & Wi-Fi.
You need about 6 GB device storage
If they are On, turn Off Hotspot & VPN.
Charge the battery > 70%.
Try again, see the following Apple articles:
Update your iPhone, iPad, or iPod touch
Update your iPhone, iPad, or iPod touch - Apple Support (IN)
If your iPhone, iPad or iPod touch won’t update
If your iPhone, iPad, or iPod touch won't update - Apple Support
You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (UK)
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support