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For software update
iPhone XR, iOS 12
You must have a stable Wi-Fi connection.
Charge the battery to 50% or higher.
Turn off Battery saving mode.
Don't use a Hotspot.
Don't use VPN.
And make sure you have enough free space.
Note:
As you are too far behind with updating your iPhone
you probably have to connect to a PC with the latest version of iTunes installed.
Its telling you why in your screenshot:
You will also need to be connected to Wi-Fi
Why I can’t install new software update ??
