The Scary Room is really interesting with all the new information.
Even back when I first started to think Ami knew everything, the presence of the Angels and other weirdness made me think everything, including whatever was on the projector, was just weird supernatural stuff.
But I think knowing what we know now about Ami, I'd bet everything involving the projector and the factory reset prank were Ami. Based on the narration and the Angel's dialogue, I think the first pictures were the wizard Maya pictures we now know Akira has lying around. Whatever comes after that is interesting though:
I'm assuming it's old pictures involving Niki that Maya destroyed? Other potential options being Noriko, or even maybe Sekai.
Either way, I think this is all stuff Ami would have access to. The only questionable bit is the part that mimics the System dialogue with all the /// but I'm gonna go out on a limb and assume if Maya's familiar with that then Ami also would be.