Unlocked I747 (ATT 4.1.1.) Upgrade? - Verizon Samsung Galaxy S III

Hi, all,
I've recently bought Galaxy S3 I747 (rom 4.1.1.) and unlocked it for using on T-mobile.
It works fine now but, I am wondering whether I could still update my rom (4.1.2 or higher) or not.
Do I need to root the phone?
Thanks.

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Click to expand...
Click to collapse
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