Sorry for the late answer, I've been kinda busy in the last weeks.

When I tried to remove the lid I had the first problem since I didn't have a torx screwdriver, went to get one and removed the single screw you mention. But after that it went difficult to remove the lid, I pulled it and tried to unlock it but it seems to be stuck or something. Actually I'm a little afraid of pulling harder and break it. I'll try later when I have the chance but that thing gave me a hard time.