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Help update and unlock

Hi friends,
I am form India and i buy my new HTC Aria phone With AT&T network with android 2.1 from USA. I have to unlock my phone for GSM network but i heard that if i unlock my phone then ill not able to update my phone. Is that right or wrong? if i have to update my phone what ill do plz help me what i have to do..
:thinking::thinking:
 

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