How can I update my iOS without wifi?
How can I update 14.5 my iOS without wifi?
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You don't sorry.
A reliable/stable/fast Wifi network connection with Internet access is mandatory to update your iPhone wirelessly (no cellular data*, no personal hotspot, no VPN connections are admitted, no low power mode), and you'd better have your iPhone plugged in during the update procedure.
Regards
Giulio
*unless you have a 5G connection