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.
TBF I always find these “futuristic design” car stereos inscrutable, and I fit into the age bracket of people who grew up with them.
Car manufacturers themselves were always better at creating simple UIs for their own stereos, in my experience.