How can i resume my update because it was paused

It was paused either because the battery fell below 50% or your device went out of the network area.

Connect to a power source and a strong & stable internet. It will resume by itself.

If you still can't install the latest version of iOS, try downloading the update again:

1. Go to Settings > General > [Device name] Storage.
2. Find the iOS update in the list of apps.
3. Tap the iOS update, then tap Delete Update.
4. Go to Settings > General > Software Update and download the latest iOS update.