HT5278 I want to update my iOS 5.1.1 from iOS 7.1.1  .... But I'm confuce because, I'm from Bangladesh , my I phone 4s is country unlocked from USA .... So my confusion is , if I update my I phone iOS , can be it lock again? Please help me.

I want to update my iOS 5.1.1 from iOS 7.1.1  .... But I'm confuce because, I'm from Bangladesh , my I phone 4s is country unlocked from USA .... So my confusion is , if I update my I phone iOS , can be it lock again? Please help me.

You apparently aren't listening or don't understand English well enough to understand the responses you're getting.
An unlocked iPhone will remain unlocked. Updating a legitimately unlocked phone does NOT affect the locked/unlocked status.
It will only lock IF the phone was hacked or jailbroken to unlock it.

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