#Failed to open MSP connection on INAV when trying to connect to FC

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tepid cosmos
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Im using Mateksys 405-wmo FC, but when i connect it doesn't show any ports, even though I can see the connection in the device manager.

clever lance
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if it's a new board that hasn't been flashed, you need to enter dfu and flash it with inav

tepid cosmos
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Then i try to flash it says: "Failed to open serial port"