Hello everyone, in June of this year, a 16 years has been judged for attempting to steal an A321.
The reason why he attempted to steal this plane is because he wanted to go back to his country: Morocco.
How did he bypass the security control?
The reason is unknown, probably he either he was followed by a family or he climbed a wall.
How did he accessed to the cockpit?
To access the aircraft cockpit, he had to move a mobile staircase.
Thanks @Delta319 for an English one