What went wrong is pretty clear actually. The world is supposed to be below the plane at all times. Specially during and after landing until the engines come to a complete stop and the people get off the plane.

For some reason this headline reminds me of this interview… https://youtu.be/3m5qxZm_JqM

What went wrong? Everyone giving an opinion, when the facts have not been established. So no right answers yet!

It never landed upside down, we can see in the video from the other plane.