Why my phone is not getting updated
My iPhone 6 not getting updated
iPhone 6, iOS 11
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Bearing in mind that an iPhone model 6 cannot support iOS versions beyond 12.5.6, because of hardware (CPU/RAM) incompatibility, these are the instructions to update your device:--> Update your iPhone, iPad, or iPod touch – Apple Support.
See also this support article, if needed:--> If your iPhone, iPad or iPod touch won’t update
Regards
Giulio