A friend upgraded his phone to the note 3 and gave me his At&t note 2. I am with Tmobile. I am going to have it unlocked. I want to root it and flash a rom to it. Since its was on At&t network do I flash it with a rom from the At&t section or Tmobile section? If i am missing anything else that is required other than which section to use for rom flashing please feel free to inform me.