How to update my iphone 6plus?
how to update my soffware iphone 6 plus
iPhone 6 Plus, iOS 12
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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.