I didn’t get a picture but it was more or less the model pictured here. The radio was showing a bunch of stuff they didn’t want to see, turns out it was stuck on “demo mode” and listing a bunch of features. The interface was unintuitive but luckily he kept a manual, so I navigated through the settings menu and turned off the demo. Sorted.
No you had to hold Select to go to the settings, Press skipforward until “Demo” option appears, then turn the dial right until it says Demo Off. I have a feeling the mistake could have been an accidental reset to default demo behaviour or activating satellite radio somehow through one of the modes.