Gan.. iphone saya 3gs SU, OS 4.1, baseband 05.13.04, kalo mau upgrade ke OS 5.1.1 ke lock ga? awalnya ane upgrade ke 6.0.1 (baseband 06.15.00) ga bs masuk homescreen, pesen nya "could not be activated.....", trus downgrade ke os 4.1 n baseband 05.13.04.