How far can I upgrade my GT-N8013?

If the following table is correct then I have a GT-N8013. I'm running KitKat 4.4.2 on it: (N8010XXUDNE4_N8010BTUDNF1_BTU_N8013.tar.md5).

How close can one get to the latest version of Android and still have a working GT-N8013?

GT-N8000 - Wifi+3G+calling
GT-N8005 - Wifi+3G
GT-N8010 - Wifi (Except USA)
GT-N8013 - Wifi (Only USA)
GT-N8020 - Wifi+LTE