This morning my phone was working fine and everything, till this afternoon when i wanted to use it to make a call, it started saying No signal so i turned it off and once i tried turning it back on the LG logo would just flash, so i took off the battery and it did the same but after a few seconds a white screen popped up saying S/W UPGRADE DO NOT UNPLUG.. (it wasn't plugged into nothing) So i left it like that for like an hour+ but nothing happened. I need help please, has any one had this same problem?