Open the first door with a jammer. Record a movie in which the door is open. When playing the movie, walk to the other side and hold the door from there. Record the next movie from that spot and at the end of the recording open next door with the jammer. Open the final door while playing the recording.
This time the code to unlock next floor is written in the text file *OsirisPassword.txt.. Enter the code to unlock access to the fourth floor.