How to update my iPhone 6 iOS?
How to update my iPhone 6 IOS
[Re-Titled by Moderator]
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To update to the most recent, compatible version of iOS 12.5.7, please see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.