How can I do a software update on my iPhone 6 without a computer
I have my settings turned on to do a automatic software update and it want download another update passed 12.5
iPhone 6, iOS 12
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The iPhone 6 is ancient and unsupported. It cannot be updated beyond iOS 12. The most recent update available for an iPhone 6 is iOS 12.5.7.
If you want to use features or apps that require iOS 13 or later, you will need to purchase a newer model iPhone.