I had a Prius of that vintage; and as I recall, the onboard infotainment system could be upgraded (both for software and navigation data, IIRC), but it was a something you had to take it into a dealer and pay several hundred dollars for, and there was no proactive notification when there were updates available or what they addressed. I doubt they are still rolling out new updates (but maybe), but even if not it may be possible (though possibly not useful for your problem) to still get whatever the last one was.