Why my update doesn't want to install?

Check these links for possible help...

If your iPhone, iPad, or iPod touch won't update - Apple Support

Updating iOS: common issues and solutions - Apple Community

Mohamed006 Said:

"Why my update doesn't want to install?"

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Updating your iPhone:

Update Using a Computer:

Use my User Tip:  Update your iPhone Using a Computer - User Tip

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update