ArduPilot Mega APM2.8 - NTF_DISPLAY_TYPE config mod

Hardware UnSupported hardware
2

You are on your own, the server only goes back to 4.3 and APM 2.8 was supported up to 3.2.1 (copter) or 3.3 (plane).

IMHO it is a total waste of your time. Did you get any other hardware from the list?