Don't all you system experts forget that, if the aircraft is travelling fast enough, the flaps won't fully extend despite the fact that they have been selected and their operation is serviceable.
True, but only over 160ish KIAS and then only from 40 back to 30 or 30 back to 25??
Re GPWS, if this aircraft was indeed not fitted with it, then that reflects (badly) on the regulatory authority.