How do I update my iPhone SE?

Use a computer or the Software Update function in Settings. If you encounter an issue other than the one listed below, describe it in this thread.

A first generation iPhone SE isn't capable of 16 or above.

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"How do I update my iPhone SE?: I won’t to update my iPhone"

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Updating an iPhone:

1. Back Up First:

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

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - User Tip