Tiltrotor -only front two motors

I’m trying to create a quad tilt rotor with only the front two tilting using custom firmware for px4.13.3 version. We have tried to implement it with SITL, but we are facing difficulties. Is there a way to do it with the custom firmware version I use?

@KevinAirbus I think this would depend on the custom firmware you are using, and not necessarily depend on upstream PX4?

How to oraganize my init.d file in v1.13.3?? I can’t find any information about front two motors tilting tiltrotor in v1.13.3