How to update 15.5.5 from 12.5.5
How to update to 15.5.5 from 12.5.5
iPhone 6, iOS 12
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How to update to 15.5.5 from 12.5.5
iPhone 6, iOS 12
The iPhone 6 cannot update further then iOS 12.5.5 due to hardware limitations
The iPhone 6 cannot update further then iOS 12.5.5 due to hardware limitations
You can't, sorry. See why in this compatibility chart:
How to update 15.5.5 from 12.5.5