Disable some POST checking on M17x R4 (insyde h2o bios) ?

[quentincc]

Hi, I have a M17x R4 without screen and lcd cable, when I'm trying to boot I'm getting 8 beep which correpond to a screen default and it's usually because it NEED it's internal screen to boot at all (even if there is an external monitor). I'm wondering if it's possible to disable some of these POST checking ? or to force display on external monitor using the dGPU or iGFX ? I was using H2OEZE but I don't find something 
Thanks you