Qgroundcontrol on boat with 2 motors

How do i setup Qgroundcontrol to a boat using differential steering with 2 motors? i used the aion robotics UGV R1, which is a rover, but after updating firmware it still still states airframe not set.

I have the same problem.My hardware is pix 2.4.8 btw.

use px4_fmu_6x_rover