MissionPlanner unable to detect my Holybro PX4_2.4.6 board to update FW

Hello,

I'm in deep troubles.

I just received my Holybro PX4_2.4.6 (http://www.holybro.com/product/pix32pixhawk-flight-controller-with-power-module/ 6).

I have trouble uploading Copter firmware through MP, because MP doesn’t recognize the board type.

The

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