Why is my iPhone 6 Plus not updating to iOS 12.5.4
Why is my iPhone 6 Plus not updating to iOS 12.5.4
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Go to---> Settings---> General---> Software-update---> Download and install the update.
You must have a stable Wi-Fi connection.
Or connect to a PC with the latest version of iTunes installed.
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.