How to update iOS 13.4 in iPhone 6s
How to update iOS 13.4 version in iPhone 6s
iPhone 6, iOS 12
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If it is a 6s model (not a 6), these are the instructions:--> Update your iPhone, iPad, or iPod touch
But if it is a model 6, there's no way to go beyond iOS 12.5.6 version.
See why in this compatibility chart:
