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For any stock Android device you have to go to Settings, navigate to About or System.
There is a field called Build Number. Click on that 7 times and it should say, "You are a developer!"
Go back to Setting, either System > Developer Settings or just Developer Settings and Enable USB debugging.
It's been so long since I've seen Onyx settings I'm not sure exactly how they did this.
If you can't find it there download and install a Launcher and you can run the Android settings, which definitely has this.
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