After doing all the updates, my phantom 2 won't fly. Doesn't seem to have sufficient revs to take off. I have two steady green lights in the front and nothing in the back. On one occasion I had two greens in the front and two reds in the back. Is this a stupid mistake or something genuinely wrong with the unit?. Battery was reading good. Since I only got it a couple of days ago, think I will send it back to B&H. I checked today and provided there is no damage, they will take it back up to 30 days. I saved all the packaging.