If I am right that exclamation mark is showing your network is not full. It's range bar.I flashed Retail Brazil 5.1 Stock ROM (Optimized) v1.0 on my XT1033 Dual-SIM. Everything is working great, except 3G (it was working before I flashed this ROM). It seems that the phone recognizes the network but a exclamation mark appears on the network connection icon and the phone doesn't connect. How can I fix this? Screenshots available below.