That's the non sat version of mib2 which is pretty unique as I recall. People ask for updates to the firmware and there are none. Mib2 software hobbyists aimed at the mib2 standard and mib2 high. FeCs have got corrupted then. Mib2 standard and high have the FeC press combination to read them.... you not been watching those YouTube videos that I slag off that leads you into trouble but has no meaningful discussion thread to get you out ?.
Obdeleven as I recall will allow you to read and write FeCs for mib2 standard but obviously if you corrupt them you are stuck. Could be backup and restore.
The mib2 standard toolbox and mib2 high toolkit allows you to write them, change them etc. But neither is for yours. Got a sneaky suspicion you might have corrupted the CarPlay one somehow or the unit managed to corrupt them. That would be unusual.
Will remember the name of the guy that does those dangerous YouTube videos that can get you into a mess... mib-helper indexes into them. Mr Fixit.
You have a MEDIA SYSTEM PLUS unit I reckon which is neither the standard or high. Missing navigation.
@leonlad is the resident expert on the mib2 standard tool box whether that's applicable or not to your unit or whether he's seen anything else. The tool kits and tool boxes meddle with the firmware so you can write the FeCs. Development hook that they use which I reckon got left out of mib3 or protected like the crown jewels.
As said by some means or other your FeCs have gone wrong. If you can bring them up on the screen you can probably cross check them with the published mib2 standard ones and work out the code of the missing one. You can try a long menu press to see if it shows them. Then work out a way of getting it in or pay a retrofitter like
@East Yorkshire Retrofits 
. Question of putting it on a bench I'd think or ODIS.