How to resolve frozen iOS update process on iPhone 14?

Did you remove the old update file and force restart the iPhone, then start the update again?

Force restart iPhone - Apple Support

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If you still can't install the latest version of iOS or iPadOS, you can download the update again.

To delete the update:

1. Go to Settings.
2. Tap General.
3. Tap [device] Storage.
4. Find the update in the list of apps.
5. Tap the update, then tap Delete Update.

To download the update again:

1. Go to Settings.
2. Tap General.
3. Tap Software Update and download the latest update.

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copied from: If your iPhone or iPad won't update - Apple Support

Did you try to repeat the update process using a fast and stable WiFi network connection?

If you don't have it, borrow one from your friends/relatives/neighbours.