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I phone 6s me 13 ka update caheye
[Personal Information Edited by Moderator]

A device running iOS 12.5.6 can not be an iPhone 6S. Instead, it has to be an iPhone 5S, 6 or 6 Plus. Neither can be updated further.
A device running iOS 12.5.6 can not be an iPhone 6S. Instead, it has to be an iPhone 5S, 6 or 6 Plus. Neither can be updated further.
Your serial number is an iPhone 6 which confirms what the screenshot shows and what stedman1 said.
Update iPhone 6s
