How do I decrypt the data?

There's another computer you can use for that.

Go to the engineering room, lowest floor. Use the dongle on the computer on the left.

You need to select the odd one out from each group.

In the first circle all numbers are prime apart from 1.

In the second circle all letters look the same upside down apart from M.

In the third circle all numbers can be divided by 3 apart from 34.