Somebody will correct me if I'm wrong since it's been almost a year since I've played.
I don't think there is a code for Lexi's laptop. There maybe was going to be one but they stopped
development of the game and only recently have maybe started to work on it again. That part
about Lexi's laptop may not even be in the future release.
Sorry I can't tell you anything for sure.
If you use the Search in the upper right of this forum page you'll see that several folks
have asked this before.