How can I update my iPhone SE?

Use a computer or the Software Update function in Settings. If you encounter a specific issue except for the one below, describe it in this thread.

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

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bonnorita Said:

"How can I update my iPhone SE?: how to do it on a SE iPhone update"

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Updating an iPhone SE:

Rather then on the iPhone itself, you can install updates using a computer.

A. Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip. If any updates are availabe, they will install, sure enough.

B. Connecting Using Ethernet:

If WiFi is giving you issues on the computer, then connect through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple