My FC can't connect to Qgroundcontrol for initial setup. even though i tried so many ways Qgroundcontrol version is 4.2.0 FC : PX41.9.0 Has anyone encountered this error before? help me

QGroundControl
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The issue could be linked to the fact that you are using version 4.2.0
Support for new flight-controllers is added in new versions of QGC.
It would try latest stable version 4.2.8

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PX4 1.9 is super old. Have you tried updating to a new version?