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#11
He could have bought an Anytime Upgrade key which is how Win7 is changed to a higher version. I'm not aware of who is stlll selling those but it's possible someone is, even MS store. I keep waiting for them to start selling all retail versions of Win7 again since it's their only successful OS now.
We are not going to help you hack a password, but if your friend wants Ultimate on his PC then tell him to follow these steps to insert the key to unlock the extra features in Ultimate: Windows Anytime Upgrade - How to - Windows 7 Forums
Be aware that most consumers don't need the few extra expensive features in Ultimate, so making the decision to change versions should be based on the features that the user knows (s)he needs: Compare Windows 7 Editions - Windows 7 Forums