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Raspberry Pi

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  • What error? Put it in your question. People are reluctant to have to view an image to find the error message. Commented Dec 22, 2017 at 8:33
  • The error is providing you with a clue: "device or resource busy" means that something else is already using the serial port. It is very likely that your OS is using the serial port as a console. This article discusses the necessary steps to disable the system console and free up the port for other uses. Commented Dec 22, 2017 at 13:41