As we have said before, the 777 won't stall. the FBW won't let it. And even if both engines fail, the RAT will provide power to autopilot and hydraulics. It will decend at a shallow angle, basically.
You mean, like an A330 ? I think Airbus was more or less, positive on that as well : the FBW will prevent a stall . We know that it's not entirely true .
I do not know the 777, but I think I remember someone stated that there is an alternate law mode, which does not guarantee AoA prot .