I want to update my iOS iPhone 6
I want to update my iPhone6s software
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iPhone 6, iOS 12
Question marked as
These are the generic instructions:--> Update your iPhone
If it is a model 6, it cannot be updated beyond iOS 12.5.6 version.
If it is a model 6s, it cannot be updated beyond iOS 15.7.2 version.
See why in this compatibility chart: