Unable to update non updated iphone

Follow the steps in the section called “If you still can't activate your iPhone or iPad, try again using your computer instead:” at If you can't activate your iPhone or iPad (Wi-Fi + Cellular) – Apple Support (UK)

alyjah04 Said:

"Unable to update non updated iphone: I have an iPhone that wasn’t updated before I reset it and won’t activate unless I update it. How would I be able to update the iPhone in order to activate it after resetting it?"

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Update Using a Computer:

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