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When you enter room 104 you will see a dying main - its Amir. Scan his implant to hack it.
This is the first time you will see it. Its a sequence of linear locations which are memories/nightmares of Amir.
For most of the time you can just run forward. The one exception is room with a small screen. Look closely, you need to find the matching door and go through them. Do it a couple of times to progress further.
After leaving Amir's mind scan all the blood stains, check his PC and leave the room.