I know a story of a guy during line training, around 120 hours, and captain left cockpit for toilet break!
The guy freaked out during his time alone in the cockpit.
I find it disturbing that the French prosecutor have come with so much, yet incomplete information.
I would think a full investigation should be completed first.
Please correct me if there is something I may have missed.
They claim the captain is heard knocking on the door, there is no mention if he attempted to enter the emergency door entry code!
If this was not entered or remembered, or entered incorrectly, then this blame on the FO is pre-mature!
There however unlikely it seems might have been some incident, maybe even a minor one, overspeed, accidentally doing something but becoming startled or incapacitated!
Maybe in the stress locked the door instead of opening it!
I have a strong feeling that this story still has a few more twists and turns, I don't feel this story adds up.
The emergency door entry code tone would be heard on the cvr, as you have a limited time to enter, however as far as I can see nothing has been mentioned about this.