What if you don’t have WiFi to do update?
how can I do update if I don’t have WiFi or internet?
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Without WiFi or a computer connected to the internet you can’t perform an update.
You’ll HAVE to find a location or friend who can assist.
An Apple Store - if there’s one nearby - is always a viable option.
The various update options are described starting here:
https://support.apple.com/en-au/HT204204