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usually when it's greyed out i can unplug the usb and replug it and be ready to touch the button at the same instant and it lets it get connected.
Astr4y4L
Silly as it seems ^^he's^^ right.
Go to settings>general>about phone>Software Info and tap on build version 8 or 10 times until it tells you that you are a developer. Then you can go back to settings and you should now see developer options. From there you can enable USB debugging.![]()