To my untrained eye, it seems like the flaps were not down AND the slats were not up, and I assume the reverse thrusters were not working either. All of this points to a failure of both the engines and the auxiliary engine, which would make it impossible to move any of those. The landing gear, however, can be lowered without any power IINM.
Regarding braking power, IINM only a minimal amount of stopping power comes from the wheels. Almost all of it comes from the flaps, slats, and reverse thrusters.
To reference another incident, the Gimli Glider incident in Canada, the pilots were able to slow down by sliding their plane alongside a median, which created enough friction to stop the plane. On that flight, however, the gas tanks were dry, which minimized the chance of a conflagration.
