SOLVED New Blue Cube Not booting after flashing Px4 firmware

I’m setting up a new Blue Cube on Kore carrier board with Px4 Firmware, But after flashing (With Qgroundcontrol mac ) it looks like it is not booting/connecting and making loud beeps.
Flashing Ardupilot gives no issues and is working just fine.
Did also try the latest “Daily build” without succes.
Can anyone point me in the right direction how to resolve this?


EDIT; Got it fixed by flashing Def build fw first.