[Q] SIM Unkocked after update? - Please answer :)

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http://forum.xda-developers.com – Hi everybody! My Note II is coming for me tomorrow, from England to Brazil, it is sim-unlocked. But I have a (maybe a noob) doubt about updates - Via Kies or ODIN: I am sure that the Big Baby Note II will receive the update to enable multi-windows coming directly from BTU - As the firmware I suppose will be BTU Unbranded. But, after the update, it will still be sim-unlocked? And if it locks again, there's an safe method to sim-unlock again? Hypothetical speaking, if it locks again. I never had an imported device, and here in Brazil all devices comes unlocked from factory - It's a La (HowTos)