I bought my iphone on amazon and when i received it the directions said to never do any of the updates. why?

I bought my iphone on amazon and when i received it the directions said to never do any of the updates. why?

If the iPhone was hacked to be unlocked, when installing an iOS update or when restoring the iPhone with iTunes if wanted or needed, doing so re-locks the iPhone to the carrier the iPhone was sold as carrier locked with when new.
If hacked to be unlocked or for any other reason, all built-in security included with iOS has been removed opening the iPhone up to malware and spyware.

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