Hello everyone, I'm new to this forum and T-Mobile too. I just switched from AT&T. Well, my problem now is that I want to update my Samsung Galaxy S3 to a newer firmware but I can't and also I want to install the official T-Mobile firmware on the phone too. My phone has Jelly Bean 4.1.1 from AT&T carrier and the model is SGH-I747. Is there anyway I can install a T-Mobile official firmware on my phone? I saw a tutorials online, but I want the help from my carrier instead of other ways. Thank you so much.
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