I recently bought a new map for my old rider (2nd edition K2), and all works well I'm happy to say.
The version now installed is: App 9.500, GPSv1.20, OS 547200, Boot 5.5012 and the map is 'Western Europe 1065.10726'.
My confusion comes from conecting to TomTom Home and viewing what was available for this map and system, and to my surprise I was informed that a new map was available - version 930.xxxx, isn't this is a previous version of the map!
Am I missing something here or does 'TomTom Home' just read the App or OS version installed?

Out in the Cold

There are 4 map releases every year, one every quarter...the latest 1070 series was released in May 2021 but the 930 series dates back to May 2014

You should ignore TomTom Home as it's obviously wrong, it might be reading an old file on the device or more likely, it could be TomTom are offering the next available map release from the last one it was officially updated with.